call () 、 apply () 与 bind () 正是让你可以 显式指定 这个调用上下文的手段。 该主题在仓库中属于核心函数概念之一， function.yaml 将其归类为 JavaScript 函数文章集合，且 this 相关文章同时被收录在 interviews.yaml 的 JavaScript 面试题集合中，是面试与日常开发的高频考点。

在JavaScript中，this指向是函数调用时动态决定的，这带来了极大的灵活性，也常常引发回调中this丢失、对象方法被拆解后指向错误等令人头疼的问题。为了人为干预这一绑定过程，Function原型上提供了call、apply、bind三个方法。call和apply会立即执行函数并显式指定this，区别在于参数传递方式：call展开 ...

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