var it=values(,,,,,,,,);
it.next();//
it.next();//
it.next();// 

function values(){
var i=,n=arguments.length;
return {
hasNext:function(){
return i<n;
},
next:function(){
if(this.hasNext()){
return arguments[i++];
}
throw new Error("已经到达最后啦");
}
}
}

var it=values(,,,,,,,,);
it.next();//undefined
it.next();//undefined
it.next();//undefined 

function values(){
var i=,n=arguments.length;//这里没有错误，arguments是values里的内置对象
return {
hasNext:function(){
return i<n;
},
next:function(){
if(this.hasNext()){
return arguments[i++];//错误出现在这里，arguments是next方法函数的内置对象。
}
throw new Error("已经到达最后啦");
}
}
} 

function values(){
var i=,n=arguments.length,arg=arguments;
return {
hasNext:function(){
return i<n;
},
next:function(){
if(this.hasNext()){
return arg[i++];
}
throw new Error("已经到达最后啦");
}
}
} 

var it=values(,,,,,,,,);
it.next();//
it.next();//
it.next();// 

function List(){
this.data=[];
}
List.prototype={
add:function(){
var args=[].slice.call(arguments)
this.data=this.data.concat(args); 
},
remove:function(i){
this.data.splice(i,);
},
iterator:function(){
return new Iterator(this);
}
}
function Iterator(list){
this.list=list;
this.cur=;
};
Iterator.prototype={
hasNext:function(){
return this.cur<this.list.data.length-;
},
next:function(){
if(this.hasNext()){
return this.list.data[this.cur++];
}
throw new Error('已经到底了~');
},
remove:function(){
this.list.remove(this.cur);
}
}
var list=new List();
var it=list.iterator();
list.add(,,,,,,,,);
it.next();//
it.next();//
it.next();//