示例代码：
Ext.onReady(function(){
var _panel = new Ext.Panel({
title:"用户登陆",
frame:true,
width:250,
height:130,
layout:"form",
labelWidth:45,
defaults:{xtype:"textfield",width:160},
items:[
{fieldLabel:"账号"},
{fieldLabel:"密码"}
],
buttons:[
{text:"确定"},
{text:"取消"}
]
});
_panel.applyToMarkup(Ext.DomHelper.append(Ext.getBody(),{
tag:"div",
cls:"contain",
cn:[
{tab:"div",cls:"center"}
]
},true).child("div"));
});效果图：
