Extjs 继承Ext.data.Store不起作用原因分析及解决

 
DocStore = Ext.extend(Ext.data.Store,{ 
initComponent:function(){ 
this.proxy = new Ext.data.HttpProxy({url:this.url}); 
this.reader = new Ext.data.JsonReader( 
{ 
totalProperty: 'results', 
root: 'rows', 
id:'docid', 
fields: ['docid', 'extention','docname', 'author', 'sizes', 'datecreated'] 
} 

); 
this.sortInfo = { field: 'datecreated', direction: 'DESC' }; 
this.remoteSort = false; 
DocStore.superclass.initComponent.call(this); 
} 
});