bind (), the difference between call (), apply () method is what is?

In common: Change this point, any calls are not at work
bind () to change the point of this, it does not call the function that returns a new function
```
    var o ={a:'abc'};
    var fn1 = fn.bind(o);//this指向o  相当o.fn
    fn1();//
```

call () function call to change and this point determines the data type ---

    var arr = [1,2,4]
    var str = '1231';
    console.log(Object.prototype.toString.call(arr));//返回Array数据类型
    console.log(Object.prototype.toString.call(str));返回String数据类型

apply () to change this point and calls the function, parameter is an array of behind the show

        //求一数组中的最大值
        var  arr = [2,13,30,1,4];
        console.log(Math.max.apply(null,arr));//利用apply()可以把数组展开单独传参
        console.log(Math.max.apply(Math,arr));
          //把数组中的元素一行展示
        console.log.apply(console,arr);//指向可以是null，主要是为了把数组展开传给console

bind (), the difference between call (), apply () method is what is?

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