本文介绍了forEach函数调用的调用上下文（this）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
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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forEach函数调用的调用上下文（this）
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