bind封装

Function.prototype.bindOne=function(context){
	if(typeof this!=='function'){
		throw new Error('bound is not callable')
	}
	//留住this
	var self=this;
	//arguments转数组，并从index=1截取
	var args=Array.prototype.slice.call(arguments,1);
	var fNop=function (){};
	var fBound=function (){
		var boundArgs=Array.prototype.slice.call(arguments);
		return self.apply(this instanceof fNop?this:context,args.concat(boundArgs))
	}
	//原型链继承
	fNop.prototype=this.prototype;
	fBound.prototype=new fNop();
	return fBound;
}
var foo={
	value:1
}
function bar(){
	console.log(this.value);
}
var a=bar.bindOne(foo)
a();