????????????call?apply??bind

????????????相同點(diǎn)：?都可以改變this指向?????

? ? ? ? ?不同點(diǎn)：?apply的第二個(gè)參數(shù)是?數(shù)組?

? ? ? ? ?不同點(diǎn)：??bind需要二次調(diào)用

????????var?obj?=?{

????????????name:'zhangsan',

????????????say:function(str,str2){

????????????????console.log(this.name+'?'+str+'?'+str2)??//?this??{name:'李二'}

????????????}

????????}

????????//?obj.say('hello')

????????//?obj.say.call({name:'李二'},'hello','world');//?obj.say?函數(shù)中的?this?變成了{(lán)name:'李二'’}

????????//?obj.say.apply({name:'李二'},['hello','world'])

???????var?f?=??obj.say.bind({name:'李二'},'hello','world');

???????f();

????????//?var?obj2?=?{

????????//?????name:'王武',

????????//?????setname:function(){

????????//?????????//?console.log(this);??//this??obj2

????????//?????????obj.say.call(this);??//?obj2:{}

????????//?????}

????????//?}

????????//?obj2.setname();