let循环中的语句在IE中无法正常工作 [英] let statement in loop doesn't work as expected in IE

问题描述

我在ECMAScript 6中尝试了一些示例。与其他浏览器相比，它的工作方式不同。这会在Firefox中返回 true ，但它会在IE中返回 false 。为什么这在Internet Explorer中有所不同？

I am trying some example in ECMAScript 6. That is working differently compared to other browsers. This returns true in Firefox, but it returns false in IE. Why is this working different in Internet Explorer?

let callbacks = []
for (let i = 0; i <= 2; i++) {
  callbacks[i] = function () { console.log(i); return i * 2 }
}
console.log(callbacks[0]() === 0);
console.log(callbacks[1]() === 2);
console.log(callbacks[2]() === 4);

推荐答案

根据 caniuse.com IE11支持让：

让变量不分别绑定到 for 循环的每次迭代

let variables are not bound separately to each iteration of for loops

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