Incorrect information of Data Types/Array Methods about thisArg

还没有人认领这个 Issue。

I was reading the article on Data Types, Array Methods when I saw the example code for thisArg. The example code below:

The explanation why the code would give a problem if we omit the thisArg argument here is:
>If in the example above we used users.filter(army.canJoin), then army.canJoin would be called as a standalone function, with this=undefined, thus leading to an instant error.

The canJoin isn't called as a standalone function. It's been called in the context of army with the dot syntax. Inside canJoin where we use the 'this' keyword, 'this' points correctly to army. The problem here for some reason is the (implicit in that case as we haven't define it) is the user member of the users array. That's what causes the error and not the omission of the thisArg.

I believe that a whole section about how 'this' works would be highly valuable as it's extremely important to know and often a source of bugs.

从 Data Types/Array Methods 文章开始，找到 issue 中展示的 thisArg 示例。根据示例的行为检查说明，然后更新措辞以准确解释问题，并评估是否需要增加一个关于 this 的更广泛章节。当文章不再将错误归因于错误的原因时，即表示完成。

由索引模型根据 Issue 内容生成。