"use strict";

 var name = "hello";

 var obj = {

　　name:"wanhong",

　　getName:function(){

　　　　console.log(this.name);

　　}

 }

// 默认调用

obj.getName(); // wanhong

// 引用调用

var fun = obj.getName;

fun(); 

// 应用apply改变context

var scope = {name:"world"};

fun.apply(scope);   // world

// 构造函数自带context

function People() {

　　this.name='wanhong';

}

var p = new People();

//构造的过程差不多如下

// var scope = {name:"wanhong"};

// scope.__proto__ = People.prototype;

// scope.constructor = People;

// People.apply(scope);

// return scope;