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如何实现bind

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    Function .prototype.bindSelf= function(context){
        var that = this;
        return function(){
            that.apply(context)
        }
    }

  • Two 

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    Function . prototype . bind2 = function(context){
        var that = this;
        //获取参数
        var args = Array.prototype.slice.call(arguments,1);
        return function(){
            var bindArgs = Array.prototype.slice.call(arguments)
            that .apply(context,args.concat(bindArgs))
        }
    }

  • Three

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    Function.prototype.bind = function(context){
        var that = this;
        var args = Array.prototype.slice.call(arguments,1);
        var Fun = function(){}
        var Func = function(){
            var bindArgs = Array.prototype.slice.call(arguments);
            that.apply(this instanceof that ? this : context,bindArgs)
        }
        Fun.prototype = this.prototype;
        Func.prototype = new Fun();
        return Func;
    }