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                ``` <script> /* * 方案二:對象鍵值對的方式 * 1.只有一個循環,所以性能很好 * 2.如果數組中出現對象則存在問題(因為對象的屬性名不能是對象,遇到會轉換為字符串);如果數組中存在數字10和字符串'10',則也會認為是重復的(對象中的屬性名是數字和字符串沒啥區別);數組中的值如果是undefined可能也會出現問題.... */ /* let arr = [1, 2, 3, 1, 1, 4, 2, 3]; let obj = {}; for (let i = 0; i < arr.length; i++) { // 把每一次循環得到的當前項,作為對象的屬性名和屬性值存儲進去 let item = arr[i]; if (obj[item] !== undefined) { // 證明對象中有這個屬性(也就是之前存儲過,數組中之前就有這個值),當前值是重復的,我們需要把當前這項的值刪掉即可 arr[i] = arr[arr.length - 1]; arr.length--; i--; continue; } obj[item] = item; } console.log(arr); */ </script> <script> /* ES6中沒有提供現成的去重辦法,但是提供了一些去重的方式 :Set數據結構*/ let obj = { y: 200 }; let arr = [obj, 1, 2, 3, 1, obj, 1, 4, 2, 3, '3', { x: 100 }, { x: 100 }]; arr = Array.from(new Set(arr)); console.log(arr); </script> ``` ![](https://img.kancloud.cn/41/0f/410f13868bc6f166b199d0fdd5129543_2162x1010.png) ![](https://img.kancloud.cn/e0/73/e073f8f9410362c940addd947e6ca077_547x347.png)
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