apply、call、bind区别、用法

经常在各种三方插件看到这几个，但是对其用法区分一直懵懵懂懂的，今天抽空做了个总结

apply、call、bind区别、用法

都是用来改变函数的this对象的指向的；
区分用法：
var  numbers = [25,35,15,195,-55 ]; 
//取number中的最大的值
console.log(Math.max(25,35,15,195,-55));//195
console.log(Math.max.apply(Math,numbers));//195
console.log(Math.max.call(Math,25,35,15,195,-55));//195
console.log(Math.max.bind(Math)(25,35,15,195,-55));//195


var  numbers = [25,35,15,195,-55 ]; 
//取number中的最大的值
Math.max(25,35,15,195,-55) //195
apply 立即调用    跟参数数组 Math.max.apply(Math,numbers);//195
call  立即调用    跟数组元素 Math.max.call(Math,25,35,15,195,-55); //195
bind  不是立即调用, 此处加()手动让其立即调用 Math.max.bind(Math)(25,35,15,195,-55);//195

var dog = {
    name:'xiaowang',
    gender:'girl',
    age:'24',
    say:function(){
        console.log(this.name+","+this.gender+","+this.age);
    }
}
var cat = {
    name:'miaomiao',
    age:'12',
    gender:'boy'
}
dog.say();//xiaowang,girl,24
dog.say.apply(cat);//miaomiao,boy,12
dog.say.call(cat);
dog.say.bind(cat)();


var mama = {
    name:'xiaowang',
    gender:'girl',
    age:'24',
    say:function(like,address){
        console.log(this.name+","+this.gender+","+this.age+','+like+','+address);
    }
}
var baba = {
    name:'miaomiao',
    age:'12',
    gender:'boy'
}
mama.say('化妆','北京');//xiaowang,girl,24,化妆,北京
mama.say.apply(baba,['打游戏','武汉']);//miaomiao,boy,12,打游戏,武汉
mama.say.call(baba,'打游戏','武汉');
mama.say.bind(baba)('打游戏','武汉');