var a={

    name:'xuux',

    fn:function(a,b){

        console.log(a+b);//

        console.log(this);//{name: "xuux", fn: ƒ}

    }

}

var b=a.fn;

b.call(a,1,2);//传入的参数要分别放入

console.log(b);//ƒ (a,b){console.log(a+b); console.log(this);}

var a={

    name:'xuux',

    fn:function(a,b){

        console.log(a+b);//

        console.log(this);//{name: "xuux", fn: ƒ}

    }

}

var b=a.fn;

b.apply(a,[1,2]);//传入的参数用数组存放

console.log(b);//ƒ (a,b){console.log(a+b); console.log(this);}

var a={

    name:'xuux',

    fn:function(a,b){

        console.log(a+b);//

        console.log(this);//{name: "xuux", fn: ƒ}

    }

}

var b=a.fn;

var c=b.bind(a,1);//传入的参数按顺序赋值

c(2);