js 数组 通过索引找元素并返回

Question

js 数组 通过索引找元素并返回该元素

Answer 1

Array.prototype.itemOf = function(index) {for (var i = 0; i < this.length; i++){if&nbsp;(i&nbsp;===&nbsp;index) {&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;this[i]; }}return -1;};