[afterCode] JavaScript 中如何快捷的创建一个含有相同初始值的数组
2016-05-05
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3.2kmap calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the array which have assigned values, including undefined. It is not called for missing elements of the array (that is, indexes ...