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並前往https://stackoverflow.com/questions/500504/why-is-using-for-in-for-array-iteration-a-bad-idea

Why is using "for...in" for array iteration a bad idea? - Stack ...

The reason is that one construct: var a = []; // Create a new empty array. a[5] = 5; // Perfectly legal JavaScript that resizes the array. for (var i = 0; ...

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