underScore学习1:匿名函数中call(this)的作用

匿名函数中(function(){}).call(this) 中的.call(this) 有什么用?

  • 我们都知道,.call()可以改变函数执行时的context,即this的指向,源码中的.call(this)
  • 主要就是,把当前的context传递给匿名函数。
  • So, if for whatever reason you use this, it's a way to make the IIFE act as if it were a member function of Foo,
  • specifically when creating instances of a user-defined object type.
    function Foo(){
    (function(){
        console.log(this);  //Foo
    }).call(this);

    (function(){
        console.log(this); //undefined in strict or global
    })();
}

var bar = new Foo;
原文地址:https://www.cnblogs.com/goodearth/p/6234694.html