Store和JsonStroe的不同写法,虽然他们是继承关系...

Ext.onReady(function(){
	var store = new Ext.data.Store({
	    proxy:new Ext.data.HttpProxy({url:'data.json'}),
	    baseParams:{'topicId':'package_2=2-1-1'},
	    reader:new Ext.data.JsonReader({
	      		totalProperty: "totalCount",
		        root: "commentList",
		        id: "ID"
	        },
	        [{name: 'topicId', mapping: 'TOPIC_ID'}]
	    )
	});
	store.load({callback:function(records,options,success){
		alert(1 + " " + success);
	}});
	
	var store2 = new Ext.data.JsonStore({   
        url:'data.json',         
        baseParams:{'topicId':'package_2=2-1-1'},   
        totalProperty: "totalCount",   
        root: "commentList",   
        id: "ID",   
        fields:[{name: 'topicId', mapping: 'TOPIC_ID'},'ID']   
    });   
    store2.load({callback:function(records,options,success){
		alert("2 " + success);
	}});
});

data.json格式也有要求,{[,,,],{,,,},...,{,,,}}形式

{
	"totalCount" : 1,
	"commentList" : 
	[{
		"USER_ID" : "001",
		"CONTENT" : "我是ADMIN,我最大",
		"USER_NAME" : "Admin",
		"ID" : 19,
		"TOPIC_ID" : "package_2=2-1-1",
		"ADD_TIME" :
		{
			"nanos" : 650365000,
			"time" : 1249747775650,
			"minutes" : 9,
			"seconds" : 35,
			"hours" : 16,
			"month" : 7,
			"timezoneOffset" : 0,
			"year" : 109,
			"day" : 6,
			"date" : 8
		},
		"TOPIC_NAME" : "套餐异动分析"
	}]
}