为什么我的this.ownerCt.title无法去得值？

Question

Ext.onReady(function(){

    var _window = new Ext.Window({
        title:'登录',
        layout:'form',
        width:280,
        height:150,
        labelWidth:50,
        plain:true,
        defaults:{width:180},
        bodyStyle:'padding:3px',
        items:[{
            xtype:'textfield',
            fieldLabel:'姓名' 
        },{
            xtype:'textfield',
            fieldLabel:'密码',
            type:'password'
        }],
        buttons:[{
            text:'确定',
            handler:function(){
                alert(this.ownerCt.title);
                //alert(this.text);this就是公布handler的对象
            }
        }]
    });
    _window.show();
});

     想知道为什么这样无法取得值？555

Answer 1

Ext.onReady(function(){

var _window = new Ext.Window({   
    title:'登录',   
    layout:'form',   
    width:280,   
    height:150,   
    labelWidth:50,   
    plain:true,   
    defaults:{width:180},   
    bodyStyle:'padding:3px',   
    items:[{   
        xtype:'textfield',   
        fieldLabel:'姓名'    
    },{   
        xtype:'textfield',   
        fieldLabel:'密码',   
        type:'password'  
    }],   
    buttons:[{   
        text:'确定',   
        handler:function(){   
            [color=red]alert(this.findParentByType("window").title); [/color]  //可以这样
            //alert(this.text);this就是公布handler的对象   
        }   
    }]   
});   
_window.show();   

});