xu_js
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xu_js
> 结果：{ 0: 1, 3: 1, length: 5 } > > 1. 首先类数组转换为数组 > [undefined, undefined, undefined, 1, undefined] > 2. 然后进行 copyWithin(0, 3) 操作得到 > [1, undefined, undefined, 1,...