prototype

//删除数组中指定位置的项并返回新书组
Array.prototype.remove = remove;
function remove(num){
var numc=parseInt(num);
if(numc<0||numc>this.length){return;}
var new1=this.slice(0,numc)
var new2=this.slice(numc+1,this.length)
return new1.concat(new2)
}
var ss=[];
ss.push(1)
ss.push(2)
ss.push(3)
ss.push(4)
ss.push(5)
var dd=ss.remove(2)
var innr="";
for(var a=0;a<dd.length;a++){
innr+=dd[a]
}
alert(innr)

//获取字符串中指定位置的字符
String.prototype.getIndexof=getidof;
function getidof(i){
var ii=parseInt(i)
if(ii<0 || ii>this.length){return "";}
return this.substr(i-1,i);
}

var ss="123456";
alert(ss.getIndexof(2))

//新的obj
function Zobj(){this.title="新的obj";}
Zobj.prototype.getTitle= function(){
return this.title;
}

var obj= new Zobj();
alert(obj.getTitle())