是否有可能在JavaScript做的foreach何时改变数组的值？ [英] is it possible to change values of the array when doing foreach in javascript?

问题描述

例如：

var arr = ["one","two","three"];

arr.forEach(function(part){
  part = "four";
  return "four";
})

alert(arr);

该阵列仍然与它的原始值，有没有什么办法有从迭代函数写访问数组的元素呢？

The array is still with it's original values, is there any way to have writing access to array's elements from iterating function ?

推荐答案

回调函数传递的元素，索引和数组本身。

The callback is passed the element, the index, and the array itself.

arr.forEach(function(part, index, theArray) {
  theArray[index] = "hello world";
});

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