【fix】UT

Author: songyumeng

test/mapboxgl/mapping/WebMapV3Spec.js

@@ -14,14 +14,6 @@ import mbglmap, { CRS, proj4, revertCRS } from '../../tool/mock_mapboxgl_map';
 import '../../resources/WebMapV3.js';
 import '../../resources/WebMapV5.js';
 var server = 'http://localhost:8190/iportal/';
-if (!Array.prototype.at) {
-  Array.prototype.at = function(n) {
-    n = Math.trunc(n) || 0;
-    if (n < 0) n += this.length;
-    if (n < 0 || n >= this.length) return undefined;
-    return this[n];
-  };
-}
 describe('mapboxgl-webmap3.0', () => {
   var originalTimeout, testDiv;
   var id = 617580084;

test/maplibregl/mapping/WebMapV3Spec.js

@@ -13,14 +13,7 @@ import * as mockL7 from '../../tool/mock_l7';
 import mbglmap, { CRS, proj4 } from '../../tool/mock_maplibregl_map';
 import '../../resources/WebMapV3.js';
 import '../../resources/WebMapV5.js';
-if (!Array.prototype.at) {
-  Array.prototype.at = function(n) {
-    n = Math.trunc(n) || 0;
-    if (n < 0) n += this.length;
-    if (n < 0 || n >= this.length) return undefined;
-    return this[n];
-  };
-}
+
 describe('maplibregl-webmap3.0', () => {
   var originalTimeout, testDiv;
   var server = 'http://localhost:8190/iportal/';

test/tool/mock_l7.js

@@ -1,3 +1,36 @@
+if (!Array.prototype.at) {
+  Object.defineProperty(Array.prototype, 'at', {
+    value: function at(index) {
+      // 1. 让 O 成为 ToObject(this)
+      if (this == null) {
+        throw new TypeError('Cannot convert undefined or null to object');
+      }
+      var O = Object(this);
+
+      // 2. 让 len 成为 ToLength(O.length)
+      var len = O.length >>> 0;
+
+      // 3. 让 relativeIndex 成为 ToInteger(index)
+      var relativeIndex = Math.trunc(index) || 0;
+
+      // 如果参数是 NaN，Math.trunc(NaN) 是 NaN，NaN || 0 会将其变成 0
+      // 这符合标准（规范中 ToIntegerOrInfinity(undefined) 结果为 0）
+
+      // 4. 计算实际索引
+      var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
+
+      // 5. 边界检查：如果超出范围，返回 undefined
+      if (k < 0 || k >= len) {
+        return undefined;
+      }
+
+      // 6. 返回对应的属性值
+      return O[k];
+    },
+    writable: true,
+    configurable: true
+  });
+}
 class Event {
   constructor() {
     this.stacks = {};