ES6标准入门中let命令提到的for循环打印i是10，如果不用let怎么替换？

Question

最近在读阮一峰老师的ES标准入门，读到第一章的时候提到了一段代码

var a = [];

for (var i = 0; i < 10; i++) {

  a[i] = function () {

    console.log(i);

  };

}

a[6](); // 10

如果想要输出6，用let就可以解决这个问题，但是如果用ES5的方法呢？IIFE可以做到，不过是立即打印出来。

Answer 1

var a = [];&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for(var i = 0; i < 10; i++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; +function(i){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; a[i] = function() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; console.log(i);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }(i);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };a[6](); // 6闭包问题