手写bind

Function.prototype.bind=function(context){
       if(typeof this !=='function'){
           throw new Error("Function .prototype.bind-what is trying to be bound is not callable")
       }
       var self=this;
       var args=Array.prototype.slice.call(arguments,1);
       var fNOP=function(){};
       var fBound=function(){
           var bindArgs=Array.prototype.slice.call(arguments);
           return self.apply(this instanceof fNOP?this:context,args.concat(bindArgs));
       }
       fNOP.prototype=this.prototype;
       fBound.prototype=new fNOP();
       return fBound;

    }

参考：

[]: https://github.com/mqyqingfeng/Blog/issues/12