Ext.extend

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Ext.MyWindow = Ext.extend(Ext.Window, {     width: 300     , height: 200     , addButtons: function () {         if (!this.buttons) {             this.buttons = [];         }         Ext.each(arguments, function (arg) {             this.buttons.push(arg);         }, this)     }     , initTools: function () {         Ext.MyWindow.superclass.initTools.call(this);         console.log("initTools");         this.addButtons([{ text: "提交", handler: this.submit.createDelegate(this) },

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{ text: "关闭", handler: this.hide.createDelegate(this)}])         }         , hide: function () {             Ext.MyWindow.superclass.hide.call(this);         }         , submit: function () {             Ext.Msg.alert("X");         }       });     Ext.onReady(function () {         var win = new Ext.MyWindow();         win.show();       });