创建模型，设置id

 /**
          * 创建模型，设置id
          */
          Ext.onReady(function(){
              Ext.define('Person',{
                 extend:'Ext.data.Model',
                 idProperty:'personId',
                 fields:[
                     {name:'name',type:'string'},
                     {name:'age',type:'int'}
                 ]
             });
             var person1 = new Person({
                 personId:'person1',
                 name:'zhouhai',
                 age:12,
             });
             var person2 = new Person({
                 personId:'person2',
                 name:'zhouhai',
                 age:12,
             });
             //这个地方还不能 直接的person.name
             //person.set({name:'hello'});

             //alert(person.get('name'));
             console.log(person1);

             console.log(person2);
         });