Extjs4中表单登录功能、登录成功跳转页面的代码

Ext.onReady(function(){ 
    Ext.QuickTips.init(); 
    Ext.create('Ext.form.Panel',{ 
        title:'form2', 
        width:300, 
        height:200, 
        frame:true, 
        renderTo:'formDemo', 
        defaultType:'textfield', 
        defaults:{ 
            allowBlank:false, 
            labelWidth:60, 
            width:240, 
            msgTarget:'side' 
             
        }, 
        items:[{ 
            name:'userName', 
            fieldLabel:'Name' 
        }, 
        { 
            name:'password', 
            fieldLabel:'Pass' 
        }],  // www.jb200.com
        buttons:[{ 
            text:'提交',handler:function(){ 
                var basic=this.up('form').getForm(); 
                basic.submit({ 
                    url:'/Extjs4/formAction!getForm.action', 
                    method:'POST', 
                    success:function(form,action){ 
                        location.href="/Extjs4/demo.html"; 
                    }, 
                    failure:function(form,action){ 
                        var data=action.response.responseText; 
                        var json = eval("("+data+")"); 
                        Ext.Msg.alert('提示',json.message); 
                    } 
                }); 
 
            } 
        }, 
        {text:'重置',handler:function(){ 
            this.up('form').getForm().reset(); 
            } 
        } 
        ] 
    }); 
});