IE,FF都不报错？不知哪错了

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
var Class = {
  create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
  }
}; 
var SomeClass = Class.create();
SomeClass.prototype = {
initialize:function(arg1,arg2.arg3){
this.name = arg1;
this.sex = arg2;
this.age = agr3;
},
disMsg:function(){
alert(11);
}
};
window.onload = function(){
var a = new SomeClass("suntiger035","male",30);
a.disMsg();
};
</script>
</head>
<body>
</body>
</html>RT