var alpha = /^[a-zA-Z_]+$/; //字母和下划线 
        var alphanum = /^[a-zA-Z0-9_]+$/; //字母、数字和下划线 
        var email = /^([\w]+)(.[\w]+)*@([\w-]+\.){1,5}([A-Za-z]){2,4}$/;//邮箱 
        var  url  =/(((https?)|(ftp)):\/\/([\-\w]+\.)+\w{2,3}(\/[%\-\w]+(\.\w{2,})?)*(([\w\-\.\?\\\/+@&#;`~=%!]* )(\.\w{2,})?)*\/?)/i;//网址 
	 var email_add = new Ext.form.TextField({
		name: "email",
		fieldLabel: "电子邮件地址",
		vtype: "email", 
		width: 200
		});

 var password_add = new Ext.form.TextField({
		name: "password",
		id:"pass1",
		fieldLabel: "用户密码",
		inputType: "password",
		width: 200
		});	
		 var password1_add = new Ext.form.TextField({
		name: "password1",
		id:"pass2",
		fieldLabel: "请在输入一次",
		inputType: "password",
		vtype:'password',    
		confirmTo:"pass1",//要比较的另外一个的组件的id
		vtypeText:"两次密码不一致！",          
		width: 200
		});	
		Ext.apply(Ext.form.VTypes,{
        password:function(val,field){//val指这里的文本框值，field指这个文本框组件，大家要明白这个意思
        if(field.confirmTo){//confirmTo是我们自定义的配置参数，一般用来保存另外的组件的id值
           var pwd=Ext.get(field.confirmTo);//取得confirmTo的那个id的值
           return (val==pwd.getValue());
         }
       return true;
          }
        });