map 获取数组下标

使用map方法获取数组下标的代码是：

var arr = [23,45,312,3213,53,23];
var index = arr.map(function(element, i) {
  return i;
});
console.log(index);

输出结果为：[0, 1, 2, 3, 4, 5] 。
这段代码通过map方法遍历数组，并将每个元素的下标返回成一个新的数组。在这个例子中，输出的结果是一个包含每个元素下标的数组[0, 1, 2, 3, 4, 5]。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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