From 8c299dfaebb9d09aa984495c3344db169566225f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B2=B3=E9=A9=AC=E5=85=88=E7=94=9F?=
 <hemaxiansheng@hemaxianshengdeMacBook-Pro.local>
Date: Tue, 19 Mar 2019 17:54:31 +0800
Subject: [PATCH 1/8] #exercise4# completed

---
 .idea/exercise4.iml         |  12 ++
 .idea/jsLibraryMappings.xml |   6 +
 .idea/misc.xml              |   6 +
 .idea/modules.xml           |   8 ++
 .idea/vcs.xml               |   6 +
 .idea/workspace.xml         | 265 ++++++++++++++++++++++++++++++++++++
 package-lock.json           |  62 +++++++++
 test/test.js                |  19 +--
 8 files changed, 375 insertions(+), 9 deletions(-)
 create mode 100644 .idea/exercise4.iml
 create mode 100644 .idea/jsLibraryMappings.xml
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 .idea/vcs.xml
 create mode 100644 .idea/workspace.xml
 create mode 100644 package-lock.json

diff --git a/.idea/exercise4.iml b/.idea/exercise4.iml
new file mode 100644
index 0000000..24643cc
--- /dev/null
+++ b/.idea/exercise4.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/jsLibraryMappings.xml b/.idea/jsLibraryMappings.xml
new file mode 100644
index 0000000..d23208f
--- /dev/null
+++ b/.idea/jsLibraryMappings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <includedPredefinedLibrary name="Node.js Core" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..28a804d
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..af3026e
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/exercise4.iml" filepath="$PROJECT_DIR$/.idea/exercise4.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..79a0f2b
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,265 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="ed94e5ec-aba6-4303-9f60-1c2d00b4676e" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/test/test.js" beforeDir="false" afterPath="$PROJECT_DIR$/test/test.js" afterDir="false" />
+    </list>
+    <ignored path="$PROJECT_DIR$/.tmp/" />
+    <ignored path="$PROJECT_DIR$/temp/" />
+    <ignored path="$PROJECT_DIR$/tmp/" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FUSProjectUsageTrigger">
+    <session id="-1168310692">
+      <usages-collector id="statistics.lifecycle.project">
+        <counts>
+          <entry key="project.open.time.0" value="1" />
+          <entry key="project.opened" value="1" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.extensions.open">
+        <counts>
+          <entry key="js" value="1" />
+          <entry key="json" value="1" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.types.open">
+        <counts>
+          <entry key="JSON" value="1" />
+          <entry key="JavaScript" value="1" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.extensions.edit">
+        <counts>
+          <entry key="js" value="230" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.types.edit">
+        <counts>
+          <entry key="JavaScript" value="230" />
+        </counts>
+      </usages-collector>
+    </session>
+  </component>
+  <component name="FileEditorManager">
+    <leaf>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/test/test.js">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="307">
+              <caret line="32" column="11" selection-start-line="32" selection-start-column="11" selection-end-line="32" selection-end-column="11" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/package.json">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="-157">
+              <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/test/test.js" />
+      </list>
+    </option>
+  </component>
+  <component name="JsBowerSettings">
+    <node-interpreter value="project" />
+    <bower-package value="" />
+    <bower.json value="" />
+  </component>
+  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER">
+    <package-json value="$PROJECT_DIR$/package.json" />
+  </component>
+  <component name="JsFlowSettings">
+    <service-enabled>true</service-enabled>
+    <exe-path />
+    <other-services-enabled>true</other-services-enabled>
+    <auto-save>true</auto-save>
+  </component>
+  <component name="JsGulpfileManager">
+    <detection-done>true</detection-done>
+    <sorting>DEFINITION_ORDER</sorting>
+  </component>
+  <component name="NodeModulesDirectoryManager">
+    <handled-path value="$PROJECT_DIR$/node_modules" />
+  </component>
+  <component name="NodePackageJsonFileManager">
+    <packageJsonPaths>
+      <path value="$PROJECT_DIR$/package.json" />
+    </packageJsonPaths>
+  </component>
+  <component name="ProjectFrameBounds">
+    <option name="y" value="23" />
+    <option name="width" value="1440" />
+    <option name="height" value="823" />
+  </component>
+  <component name="ProjectInspectionProfilesVisibleTreeState">
+    <entry key="Project Default">
+      <profile-state>
+        <expanded-state>
+          <State />
+          <State>
+            <id>CSS</id>
+          </State>
+          <State>
+            <id>Probable bugsCSS</id>
+          </State>
+          <State>
+            <id>RELAX NG</id>
+          </State>
+          <State>
+            <id>XPath</id>
+          </State>
+          <State>
+            <id>XSLT</id>
+          </State>
+        </expanded-state>
+        <selected-state>
+          <State>
+            <id>Angular</id>
+          </State>
+        </selected-state>
+      </profile-state>
+    </entry>
+  </component>
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="exercise4" type="b2602c69:ProjectViewProjectNode" />
+              <item name="exercise4" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="exercise4" type="b2602c69:ProjectViewProjectNode" />
+              <item name="exercise4" type="462c0819:PsiDirectoryNode" />
+              <item name="test" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+      <pane id="Scope" />
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="javascript.nodejs.core.library.configured.version" value="8.12.0" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+    <property name="nodejs_interpreter_path" value="/usr/local/bin/node" />
+    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
+    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
+    <property name="nodejs_package_manager_path" value="npm" />
+    <property name="settings.editor.selected.configurable" value="Errors" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="ed94e5ec-aba6-4303-9f60-1c2d00b4676e" name="Default Changelist" comment="" />
+      <created>1552988449693</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1552988449693</updated>
+      <workItem from="1552988451161" duration="658000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="658000" />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="0" y="23" width="1440" height="823" extended-state="6" />
+    <layout>
+      <window_info id="npm" side_tool="true" />
+      <window_info id="Favorites" side_tool="true" />
+      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.24947146" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info anchor="bottom" id="Docker" show_stripe_button="false" />
+      <window_info anchor="bottom" id="Version Control" show_stripe_button="false" />
+      <window_info active="true" anchor="bottom" id="Terminal" visible="true" weight="0.32867134" />
+      <window_info anchor="bottom" id="Event Log" side_tool="true" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="bottom" id="Run" order="2" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+    </layout>
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/test/test.js">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="307">
+          <caret line="32" column="11" selection-start-line="32" selection-start-column="11" selection-end-line="32" selection-end-column="11" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/package.json">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-157">
+          <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ScopeChooserConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..4742ba2
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,62 @@
+{
+  "name": "exercise4",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "should": {
+      "version": "11.2.1",
+      "resolved": "http://registry.npm.taobao.org/should/download/should-11.2.1.tgz",
+      "integrity": "sha1-kPVRRVUtAc/CAGZuToGKHJZw7aI=",
+      "dev": true,
+      "requires": {
+        "should-equal": "^1.0.0",
+        "should-format": "^3.0.2",
+        "should-type": "^1.4.0",
+        "should-type-adaptors": "^1.0.1",
+        "should-util": "^1.0.0"
+      }
+    },
+    "should-equal": {
+      "version": "1.0.1",
+      "resolved": "http://registry.npm.taobao.org/should-equal/download/should-equal-1.0.1.tgz",
+      "integrity": "sha1-C26VFvJgGp+wuy3MNpr6HH4gCvc=",
+      "dev": true,
+      "requires": {
+        "should-type": "^1.0.0"
+      }
+    },
+    "should-format": {
+      "version": "3.0.3",
+      "resolved": "http://registry.npm.taobao.org/should-format/download/should-format-3.0.3.tgz",
+      "integrity": "sha1-m/yPdPo5IFxT04w01xcwPidxJPE=",
+      "dev": true,
+      "requires": {
+        "should-type": "^1.3.0",
+        "should-type-adaptors": "^1.0.1"
+      }
+    },
+    "should-type": {
+      "version": "1.4.0",
+      "resolved": "http://registry.npm.taobao.org/should-type/download/should-type-1.4.0.tgz",
+      "integrity": "sha1-B1bYzoRt/QmEOmlHcZ36DUz/XPM=",
+      "dev": true
+    },
+    "should-type-adaptors": {
+      "version": "1.1.0",
+      "resolved": "http://registry.npm.taobao.org/should-type-adaptors/download/should-type-adaptors-1.1.0.tgz",
+      "integrity": "sha1-QB5/M7VTMDOUTVzYvytlAneS4no=",
+      "dev": true,
+      "requires": {
+        "should-type": "^1.3.0",
+        "should-util": "^1.0.0"
+      }
+    },
+    "should-util": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/should-util/download/should-util-1.0.0.tgz",
+      "integrity": "sha1-yYzaN0qmsZDfi6h8mInCtNtiAGM=",
+      "dev": true
+    }
+  }
+}
diff --git a/test/test.js b/test/test.js
index 63a72e4..41d4dd8 100644
--- a/test/test.js
+++ b/test/test.js
@@ -3,19 +3,19 @@ describe('this', function () {
     var obj = {
       say: function () {
         setTimeout(() => {
-          // this 是什么？想想为什么？
-          this.should.equal(null)
+          // 箭头函数跟函数的调用位置无关，this的指向是最靠近的父函数的作用域，即是say函数的调用对象
+          this.should.equal(obj);
           done()
         }, 0)
       }
     }
     obj.say()
-  }) 
+  })
 
   it('global', function () {
     function test() {
-      // this 是什么？想想为什么？
-      this.should.equal(null)
+      // 全局调用
+      this.should.equal(global)
     }
     test()
   })
@@ -25,8 +25,9 @@ describe('this', function () {
       var obj = {
         say: function () {
           function _say() {
-            // this 是什么？想想为什么？
-            this.should.equal(null)
+            // 在定义函数的时候立即执行函数，虽然使用bind绑定obj对象，但是此时obj还未创建完毕，undefined
+              // bind在绑定的对象为undefined的时候，默认是绑定全局对象，此时执行的为node环境，所以为global
+            this.should.equal(global)
           }
           return _say.bind(obj)
         }()
@@ -39,11 +40,11 @@ describe('this', function () {
       obj.say = function () {
         function _say() {
           // this 是什么？想想为什么？
-          this.should.equal(null)
+          this.should.equal(obj)
         }
         return _say.bind(obj)
       }()
       obj.say()
     })
   })
-})
\ No newline at end of file
+})

From 4e9e9a6a44fba541f59dd93d0f1786c7534fa76f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B2=B3=E9=A9=AC=E5=85=88=E7=94=9F?=
 <hemaxiansheng@hemaxianshengdeMacBook-Pro.local>
Date: Tue, 19 Mar 2019 17:55:45 +0800
Subject: [PATCH 2/8] #exercise# ignore .idea

---
 .gitignore          |  3 ++-
 .idea/workspace.xml | 39 ++++++++++++++++++++++++++++++---------
 2 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/.gitignore b/.gitignore
index b512c09..eb79dd5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+.idea
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 79a0f2b..dc83ebb 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,8 +2,7 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="ed94e5ec-aba6-4303-9f60-1c2d00b4676e" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/test/test.js" beforeDir="false" afterPath="$PROJECT_DIR$/test/test.js" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/.tmp/" />
     <ignored path="$PROJECT_DIR$/temp/" />
@@ -24,6 +23,7 @@
       </usages-collector>
       <usages-collector id="statistics.file.extensions.open">
         <counts>
+          <entry key="gitignore" value="1" />
           <entry key="js" value="1" />
           <entry key="json" value="1" />
         </counts>
@@ -32,16 +32,19 @@
         <counts>
           <entry key="JSON" value="1" />
           <entry key="JavaScript" value="1" />
+          <entry key="PLAIN_TEXT" value="1" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.extensions.edit">
         <counts>
+          <entry key="gitignore" value="6" />
           <entry key="js" value="230" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.edit">
         <counts>
           <entry key="JavaScript" value="230" />
+          <entry key="PLAIN_TEXT" value="6" />
         </counts>
       </usages-collector>
     </session>
@@ -57,15 +60,24 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/package.json">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="-157">
+            <state relative-caret-position="156">
               <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
             </state>
           </provider>
         </entry>
       </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/.gitignore">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="26">
+              <caret line="1" column="5" selection-start-line="1" selection-start-column="5" selection-end-line="1" selection-end-column="5" />
+            </state>
+          </provider>
+        </entry>
+      </file>
     </leaf>
   </component>
   <component name="Git.Settings">
@@ -75,6 +87,7 @@
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/test/test.js" />
+        <option value="$PROJECT_DIR$/.gitignore" />
       </list>
     </option>
   </component>
@@ -195,23 +208,24 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1552988449693</updated>
-      <workItem from="1552988451161" duration="658000" />
+      <workItem from="1552988451161" duration="830000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="658000" />
+    <option name="totallyTimeSpent" value="830000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="0" y="23" width="1440" height="823" extended-state="6" />
+    <editor active="true" />
     <layout>
       <window_info id="npm" side_tool="true" />
       <window_info id="Favorites" side_tool="true" />
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.24947146" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24947146" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info anchor="bottom" id="Docker" show_stripe_button="false" />
       <window_info anchor="bottom" id="Version Control" show_stripe_button="false" />
-      <window_info active="true" anchor="bottom" id="Terminal" visible="true" weight="0.32867134" />
+      <window_info anchor="bottom" id="Terminal" visible="true" weight="0.31748253" />
       <window_info anchor="bottom" id="Event Log" side_tool="true" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Find" order="1" />
@@ -241,11 +255,18 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/package.json">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="-157">
+        <state relative-caret-position="156">
           <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/.gitignore">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="26">
+          <caret line="1" column="5" selection-start-line="1" selection-start-column="5" selection-end-line="1" selection-end-column="5" />
+        </state>
+      </provider>
+    </entry>
   </component>
   <component name="masterDetails">
     <states>

From 8ab4ad791c0b6bbf5c1c5cbc53e5db9e1814876b Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:15 +0800
Subject: [PATCH 3/8] Delete exercise4.iml

---
 .idea/exercise4.iml | 12 ------------
 1 file changed, 12 deletions(-)
 delete mode 100644 .idea/exercise4.iml

diff --git a/.idea/exercise4.iml b/.idea/exercise4.iml
deleted file mode 100644
index 24643cc..0000000
--- a/.idea/exercise4.iml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$">
-      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
-      <excludeFolder url="file://$MODULE_DIR$/temp" />
-      <excludeFolder url="file://$MODULE_DIR$/tmp" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
\ No newline at end of file

From 910929afcdb3aeb2a2894b2f9fbf48a87e6442a5 Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:24 +0800
Subject: [PATCH 4/8] Delete jsLibraryMappings.xml

---
 .idea/jsLibraryMappings.xml | 6 ------
 1 file changed, 6 deletions(-)
 delete mode 100644 .idea/jsLibraryMappings.xml

diff --git a/.idea/jsLibraryMappings.xml b/.idea/jsLibraryMappings.xml
deleted file mode 100644
index d23208f..0000000
--- a/.idea/jsLibraryMappings.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="JavaScriptLibraryMappings">
-    <includedPredefinedLibrary name="Node.js Core" />
-  </component>
-</project>
\ No newline at end of file

From 64bb9f20f067e7532f44b880aa69ea023fd5e3f9 Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:33 +0800
Subject: [PATCH 5/8] Delete misc.xml

---
 .idea/misc.xml | 6 ------
 1 file changed, 6 deletions(-)
 delete mode 100644 .idea/misc.xml

diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 28a804d..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="JavaScriptSettings">
-    <option name="languageLevel" value="ES6" />
-  </component>
-</project>
\ No newline at end of file

From f616a8707598fa0a16924eaa8c803d6be5b35048 Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:40 +0800
Subject: [PATCH 6/8] Delete modules.xml

---
 .idea/modules.xml | 8 --------
 1 file changed, 8 deletions(-)
 delete mode 100644 .idea/modules.xml

diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index af3026e..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/exercise4.iml" filepath="$PROJECT_DIR$/.idea/exercise4.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file

From ade1eb0f3522c6cf1e96b900dd421c980841f5c6 Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:48 +0800
Subject: [PATCH 7/8] Delete vcs.xml

---
 .idea/vcs.xml | 6 ------
 1 file changed, 6 deletions(-)
 delete mode 100644 .idea/vcs.xml

diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file

From c572ddd633cd6839e043684eadf61ac7f95f223d Mon Sep 17 00:00:00 2001
From: 1415757704 <1415757704@qq.com>
Date: Tue, 19 Mar 2019 17:57:55 +0800
Subject: [PATCH 8/8] Delete workspace.xml

---
 .idea/workspace.xml | 286 --------------------------------------------
 1 file changed, 286 deletions(-)
 delete mode 100644 .idea/workspace.xml

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index dc83ebb..0000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,286 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ChangeListManager">
-    <list default="true" id="ed94e5ec-aba6-4303-9f60-1c2d00b4676e" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
-    </list>
-    <ignored path="$PROJECT_DIR$/.tmp/" />
-    <ignored path="$PROJECT_DIR$/temp/" />
-    <ignored path="$PROJECT_DIR$/tmp/" />
-    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="FUSProjectUsageTrigger">
-    <session id="-1168310692">
-      <usages-collector id="statistics.lifecycle.project">
-        <counts>
-          <entry key="project.open.time.0" value="1" />
-          <entry key="project.opened" value="1" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.extensions.open">
-        <counts>
-          <entry key="gitignore" value="1" />
-          <entry key="js" value="1" />
-          <entry key="json" value="1" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.types.open">
-        <counts>
-          <entry key="JSON" value="1" />
-          <entry key="JavaScript" value="1" />
-          <entry key="PLAIN_TEXT" value="1" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.extensions.edit">
-        <counts>
-          <entry key="gitignore" value="6" />
-          <entry key="js" value="230" />
-        </counts>
-      </usages-collector>
-      <usages-collector id="statistics.file.types.edit">
-        <counts>
-          <entry key="JavaScript" value="230" />
-          <entry key="PLAIN_TEXT" value="6" />
-        </counts>
-      </usages-collector>
-    </session>
-  </component>
-  <component name="FileEditorManager">
-    <leaf>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/test/test.js">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="307">
-              <caret line="32" column="11" selection-start-line="32" selection-start-column="11" selection-end-line="32" selection-end-column="11" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/package.json">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="156">
-              <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/.gitignore">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="26">
-              <caret line="1" column="5" selection-start-line="1" selection-start-column="5" selection-end-line="1" selection-end-column="5" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-    </leaf>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="IdeDocumentHistory">
-    <option name="CHANGED_PATHS">
-      <list>
-        <option value="$PROJECT_DIR$/test/test.js" />
-        <option value="$PROJECT_DIR$/.gitignore" />
-      </list>
-    </option>
-  </component>
-  <component name="JsBowerSettings">
-    <node-interpreter value="project" />
-    <bower-package value="" />
-    <bower.json value="" />
-  </component>
-  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER">
-    <package-json value="$PROJECT_DIR$/package.json" />
-  </component>
-  <component name="JsFlowSettings">
-    <service-enabled>true</service-enabled>
-    <exe-path />
-    <other-services-enabled>true</other-services-enabled>
-    <auto-save>true</auto-save>
-  </component>
-  <component name="JsGulpfileManager">
-    <detection-done>true</detection-done>
-    <sorting>DEFINITION_ORDER</sorting>
-  </component>
-  <component name="NodeModulesDirectoryManager">
-    <handled-path value="$PROJECT_DIR$/node_modules" />
-  </component>
-  <component name="NodePackageJsonFileManager">
-    <packageJsonPaths>
-      <path value="$PROJECT_DIR$/package.json" />
-    </packageJsonPaths>
-  </component>
-  <component name="ProjectFrameBounds">
-    <option name="y" value="23" />
-    <option name="width" value="1440" />
-    <option name="height" value="823" />
-  </component>
-  <component name="ProjectInspectionProfilesVisibleTreeState">
-    <entry key="Project Default">
-      <profile-state>
-        <expanded-state>
-          <State />
-          <State>
-            <id>CSS</id>
-          </State>
-          <State>
-            <id>Probable bugsCSS</id>
-          </State>
-          <State>
-            <id>RELAX NG</id>
-          </State>
-          <State>
-            <id>XPath</id>
-          </State>
-          <State>
-            <id>XSLT</id>
-          </State>
-        </expanded-state>
-        <selected-state>
-          <State>
-            <id>Angular</id>
-          </State>
-        </selected-state>
-      </profile-state>
-    </entry>
-  </component>
-  <component name="ProjectView">
-    <navigator proportions="" version="1">
-      <foldersAlwaysOnTop value="true" />
-    </navigator>
-    <panes>
-      <pane id="ProjectPane">
-        <subPane>
-          <expand>
-            <path>
-              <item name="exercise4" type="b2602c69:ProjectViewProjectNode" />
-              <item name="exercise4" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="exercise4" type="b2602c69:ProjectViewProjectNode" />
-              <item name="exercise4" type="462c0819:PsiDirectoryNode" />
-              <item name="test" type="462c0819:PsiDirectoryNode" />
-            </path>
-          </expand>
-          <select />
-        </subPane>
-      </pane>
-      <pane id="Scope" />
-    </panes>
-  </component>
-  <component name="PropertiesComponent">
-    <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="javascript.nodejs.core.library.configured.version" value="8.12.0" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="nodejs_interpreter_path" value="/usr/local/bin/node" />
-    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
-    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
-    <property name="nodejs_package_manager_path" value="npm" />
-    <property name="settings.editor.selected.configurable" value="Errors" />
-  </component>
-  <component name="RunDashboard">
-    <option name="ruleStates">
-      <list>
-        <RuleState>
-          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
-        </RuleState>
-        <RuleState>
-          <option name="name" value="StatusDashboardGroupingRule" />
-        </RuleState>
-      </list>
-    </option>
-  </component>
-  <component name="SvnConfiguration">
-    <configuration />
-  </component>
-  <component name="TaskManager">
-    <task active="true" id="Default" summary="Default task">
-      <changelist id="ed94e5ec-aba6-4303-9f60-1c2d00b4676e" name="Default Changelist" comment="" />
-      <created>1552988449693</created>
-      <option name="number" value="Default" />
-      <option name="presentableId" value="Default" />
-      <updated>1552988449693</updated>
-      <workItem from="1552988451161" duration="830000" />
-    </task>
-    <servers />
-  </component>
-  <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="830000" />
-  </component>
-  <component name="ToolWindowManager">
-    <frame x="0" y="23" width="1440" height="823" extended-state="6" />
-    <editor active="true" />
-    <layout>
-      <window_info id="npm" side_tool="true" />
-      <window_info id="Favorites" side_tool="true" />
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24947146" />
-      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
-      <window_info anchor="bottom" id="Docker" show_stripe_button="false" />
-      <window_info anchor="bottom" id="Version Control" show_stripe_button="false" />
-      <window_info anchor="bottom" id="Terminal" visible="true" weight="0.31748253" />
-      <window_info anchor="bottom" id="Event Log" side_tool="true" />
-      <window_info anchor="bottom" id="Message" order="0" />
-      <window_info anchor="bottom" id="Find" order="1" />
-      <window_info anchor="bottom" id="Run" order="2" />
-      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
-      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
-      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
-      <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
-      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
-      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
-    </layout>
-  </component>
-  <component name="TypeScriptGeneratedFilesManager">
-    <option name="version" value="1" />
-  </component>
-  <component name="VcsContentAnnotationSettings">
-    <option name="myLimit" value="2678400000" />
-  </component>
-  <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/test/test.js">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="307">
-          <caret line="32" column="11" selection-start-line="32" selection-start-column="11" selection-end-line="32" selection-end-column="11" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/package.json">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="156">
-          <caret line="6" column="19" lean-forward="true" selection-start-line="6" selection-start-column="19" selection-end-line="6" selection-end-column="19" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/.gitignore">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="26">
-          <caret line="1" column="5" selection-start-line="1" selection-start-column="5" selection-end-line="1" selection-end-column="5" />
-        </state>
-      </provider>
-    </entry>
-  </component>
-  <component name="masterDetails">
-    <states>
-      <state key="ScopeChooserConfigurable.UI">
-        <settings>
-          <splitter-proportions>
-            <option name="proportions">
-              <list>
-                <option value="0.2" />
-              </list>
-            </option>
-          </splitter-proportions>
-        </settings>
-      </state>
-    </states>
-  </component>
-</project>
\ No newline at end of file