forEach函数调用的调用上下文（this） [英] The invocation context (this) of the forEach function call

问题描述

我想知道'this'值（或调用上下文）是什么forEach回调函数。这段代码似乎不起作用：

I was wondering what the 'this' value (or invocation context) is of the forEach callback function. This code doesn't seem to work:

var jow = [5, 10, 45, 67];

jow.forEach(function(v, i, a){

    this[i] = v + 1;

});

alert(jow);

Thx向我解释。

Thx for explaining it to me.

推荐答案

我完成了forEach方法的构建，并希望与大家分享这个图，希望它能帮助别人试图理解它的内部运作。

I finished construction of the forEach method and wanted to share this diagram with everyone, hope it helps someone else trying to understand its inner workings.

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