为什么引用'this'会返回值，它应该是未定义的？

Question

I have the module...

var myModule = (function(){

    var obj = new Object();
    obj.name = "";
    obj.sayName = function(){
        obj.name = "jon";
        console.log(obj.name); 
        console.log(this.name);  
    }
    return obj;

})()

myModule.sayName();

This prints the word 'jon' twice as per the console.log statements.

However I don't really understand why 'this' is correct since it would return the reference to the function and be 'undefined' wouldn't it?

Answer 1

You are calling myModule.sayName() so this inside sayName is myModule .

The value of myModule is copy of the object reference from obj (since that is what is returned from the anonymous IIFE).

Therefore obj.name and this.name are the same value.