JS small practice code_javascript skills

There is no html code, only JS code. The small exercises are as follows: (Learned from teacher Chen Zhiwen’s course)
<script> <BR>Ext.onReady(function(){ <BR>// Ext.Msg.alert("系统提示(thtwinj2ee)","环境配置正确!") ; <BR>var myPosition = Ext.data.Record.create( <BR>[{name:"position"}] <BR>) ;//返回一个function <BR>new Ext.Window({ <BR>title:"测试用窗口(绝不裸奔)", <BR>width:550, <BR>height:370, <BR>labelWidth:70, <BR>plain:true , <BR>layout:"form", <BR>defaults:{anchor:"95%"}, <BR>// buttonAlign:"center", <BR>items: <BR>[ <BR>{ <BR>layout:"column", <BR>baseCls:"x-plain", <BR>style:"padding:8px", <BR>items: <BR>[ <BR>{ <BR>columnWidth:.5, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>labelWidth:70, <BR>defaults:{width:150}, <BR>defaultType:"textfield", <BR>items: <BR>[ <BR>{ <BR>fieldLabel:"姓名" <BR>}, <BR>{ <BR>fieldLabel:"年龄", <BR>value:23, <BR>readOnly:true <BR>}, <BR>{ <BR>xtype:"datefield", <BR>format:"Y-m-d", <BR>value:"1986-11-16", <BR>readOnly:true, <BR>fieldLabel:"出生日期", <BR>listeners: <BR>{ <BR>"blur":function(_df) <BR>{ <BR>var _age = _df.ownerCt.findByType("textfield")[1] ; <BR>_age.setValue(new Date().getFullYear() - _df.getValue().getFullYear() + 1) ; <BR>} <BR>} <BR>}, <BR>{ <BR>fieldLabel:"联系电话" <BR>}, <BR>{ <BR>fieldLabel:"手机号码" <BR>}, <BR>{ <BR>fieldLabel:"电子邮件" <BR>}, <BR>{ <BR>xtype:"combo", <BR>fieldLabel:"性别", <BR>readOnly:true, <BR>displayField:"sex", <BR>value:"男", <BR>triggerAction:"all", <BR>mode:"local", <BR>store:new Ext.data.SimpleStore <BR>( <BR>{ <BR>fields:["sex"], <BR>data:[["男"],["女"]] <BR>} <BR>) <BR>} <BR>] <BR>}, <BR>{ <BR>columnWidth:.5, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>labelWidth:55, <BR>items: <BR>[ <BR>{ <BR>xtype:"textfield", <BR>width:185, <BR>height:178, <BR>fieldLabel:"个人头像", <BR>inputType:"image" <BR>} <BR>] <BR>} <BR>] <BR>}, <BR>{ <BR>layout:"form", <BR>baseCls:"x-plain", <BR>style:"padding:2px,8px,8px,8px", <BR>defaultType:"textfield", <BR>labelWidth:71, <BR>items: <BR>[ <BR>{ <BR>fieldLabel:"身份证号码", <BR>width:415 <BR>}, <BR>{ <BR>fieldLabel:"具体住址", <BR>width:415 <BR>} <BR>] <BR>}, <BR>{ <BR>layout:"column", <BR>baseCls:"x-plain", <BR>style:"padding:2px,8px,8px,8px", <BR>items: <BR>[ <BR>{ <BR>columnWidth:.4, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>labelWidth:70, <BR>items: <BR>[ <BR>{ <BR>xtype:"combo", <BR>readOnly:true, <BR>mode:"local", <BR>triggerAction:"all", <BR>displayField:"position", <BR>width:100, <BR>fieldLabel:"职称", <BR>value:"初级程序员", <BR>store:new Ext.data.SimpleStore <BR>( <BR>{ <BR>fields:["position"], <BR>data:[["中级程序员"],["高级程序员"],["项目经理"]] <BR>} <BR>) <BR>} <BR>] <BR>}, <BR>{ <BR>columnWidth:.2, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>items: <BR>[ <BR>{ <BR>xtype:"button", <BR>text:"添加职位", <BR>handler:function() <BR>{ <BR>var _window = this.ownerCt.ownerCt.ownerCt ; <BR>var _position = _window.findByType("combo")[1] ; <BR>Ext.Msg.prompt <BR>( <BR>"添加职位", <BR>"请输入将要添加的职位内容", <BR>function(_btn,_text) <BR>{ <BR>if(_btn == "ok") <BR>{ <BR>var _store = this.store ; <BR>_store.insert(0,new myPosition({position:_text})) ; <BR>this.setValue(_text) ; <BR>} <BR>}, _position //用来代替前面function()中的this对象 <BR>); <BR>} <BR>} <BR>] <BR>}, <BR>{ <BR>columnWidth:.2, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>items: <BR>[ <BR>{ <BR>xtype:"button", <BR>text:"修改职位", <BR>handler:function() <BR>{ <BR>var _window = this.ownerCt.ownerCt.ownerCt ; <BR>var _position = _window.findByType("combo")[1] ; <BR>Ext.Msg.prompt( <BR>"修改职位(绝不裸奔)", <BR>"请输入你将要修改的内容:", <BR>function(_btn,_text) <BR>{ <BR>if(_btn == "ok") <BR>{ <BR>this.setValue(_text) ; <BR>} <BR>}, <BR>_position, <BR>false, <BR>_position.getValue() <BR>) ; <BR>} <BR>} <BR>] <BR>}, <BR>{ <BR>columnWidth:.2, <BR>layout:"form", <BR>baseCls:"x-plain", <BR>items: <BR>[ <BR>{ <BR>xtype:"button", <BR>text:"删除职位", <BR>handler:function() <BR>{ <BR>var _window = this.ownerCt.ownerCt.ownerCt ; <BR>var _position = _window.findByType("combo")[1] ; <BR>Ext.Msg.confirm <BR>( <BR>"警告(thtwinj2ee)", <BR>"你真的要删除该项内容吗?", <BR>function(_btn) <BR>{ <BR>if(_btn == "yes") <BR>{ <BR>this.store.remove(this["selectItem"]) ; <BR>if(this.store.getCount() != 0) <BR>{ <BR>this.setValue(this.store.getAt(0).get("position")) ; <BR>this["selectItem"] = this.store.getAt(0).get("position") ; <BR>} <BR>} <BR>}, <BR>_position <BR>) ; <BR>} <BR>} <BR>] <BR>} <BR>] <BR>} <BR>], <BR>listeners: <BR>{ <BR>"show":function(_window) <BR>{ <BR>_window.findByType("textfield")[5].getEl().dom.src = "02.jpg" ; <BR>} <BR>}, <BR>buttons: <BR>[ <BR>{ <BR>text:"确定" <BR>}, <BR>{ <BR>text:"取消" <BR>} <BR>] <BR>}).show() ; <BR>}) ; <BR></script>