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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                ## for-in 循環 只用于 object/map/hash 的遍歷 對 `Array` 用 `for-in` 循環有時會出錯. 因為它并不是從 `0` 到 `length - 1` 進行遍歷, 而是所有出現在對象及其原型鏈的鍵值. 下面就是一些失敗的使用案例: ``` function printArray(arr) { for (var key in arr) { print(arr[key]); } } printArray([0,1,2,3]); // This works. var a = new Array(10); printArray(a); // This is wrong. a = document.getElementsByTagName('*'); printArray(a); // This is wrong. a = [0,1,2,3]; a.buhu = 'wine'; printArray(a); // This is wrong again. a = new Array; a[3] = 3; printArray(a); // This is wrong again. ``` 而遍歷數組通常用最普通的 for 循環. ``` function printArray(arr) { var l = arr.length; for (var i = 0; i < l; i++) { print(arr[i]); } } ```
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