学习和应用extjs Developing with Extjs - tricks and tips. (1)

来源http://www.akbkhome.com/blog.php/View/137/Developing_with_Extjs__tricks_and_tips.html
定义对象：
下面是定义对象简单方式：
aaa = { 
   ccc: "test",
   bbb : function() {
      alert(this.cc);
  }
}
aaa.bbb();

定义对象私有变量可以这样：
aaa = (function () {
    var myprivate;
    return {
    setIt: function(val) {
               myprivate = val;
         }
         getIt: function() {
             return myprivate;
         }   
    }
})();

用Ext.extend来扩展对象
function MyCombo (config) {
// set up your datasource here..
     MyCombo.superclass.constructor.call(this,config);
}
Ext.extend(MyCombo, Ext.form.ComboBox, {
    displayField:'title',
    typeAhead: true,
    loadingText: 'Searching...',
    forceSelection: true,
    allowBlank: false,
    width: 160,
    minChars: 1,
    pageSize:10,
    hideTrigger:true,
    displayField: 'FullName',
    valueField: 'id'
}