Functions as Methods

JavaScript this关键字详解

最新推荐文章于 2025-06-14 19:50:01 发布

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本文深入探讨了JavaScript中this关键字的工作原理及其在不同上下文中的行为表现。特别关注当函数作为普通函数而非方法调用时，this指向全局对象的情况，包括在方法内部的嵌套函数调用时的特殊情况。

When a function is invoked as a function rather that as a method, the this keyword refers to the global
object. Confusingly, this is true even when a nested function is invoked (as a function) within a containing
method that was invoked as a method: the this keyword has one value in the containing function but
(counterintuitively) refers to the global object within the body of the nested function.
Note that this is a keyword, not a variable or property name. JavaScript syntax does not allow you to
assign a value to this .