call apply bind?改版this指向

//var name ='jary'；

//var a ={

? ? ?name:'Tom'，

say:function(){

console.log(this,name);

}

}

var f =a,say；

var obj={

name:'zhangsan',

say：function(str,str2){

conslole.log(this.name+ ' '+str+' ' +str2)

??//?obj.say.call({name:'寧寧'});

????obj.say.call({name:'寧寧'},'hello','world');

????obj.say.apply({name:'寧寧'},'hello','world');

????var?f?=?obj.bind({name:'寧寧'})