ExtJs GridPanel 加载XML数据问题

[dfsdfwefwef]

Ext.onReady(function() {
	var cm = new Ext.grid.ColumnModel([
		{ header : 'id' , dataIndex : 'buyerId' },
		{ header : '客户' , dataIndex : 'buyerName' },
		{ header : '银行' , dataIndex : 'bank' },
		{ header : '银行账号' , dataIndex : 'bankAccount' }
	]);
	
	var data = [
		[ '11' , '11' , '11' ],
		[ '22' , '22' , '22' ],
		[ '33' , '33' , '33' ]
	];
	
	var reader = new Ext.data.XmlReader({
		totalRecords : 'total',
		record : 'item',
		id : 'buyerId'
	}, [
		{ name : 'buyerId' , mappint : 'buyerId' },
		{ name : 'buyerName' , mappint : 'buyerName' },
		{ name : 'bank' , mappint : 'bank' },
		{ name : 'bankAccount' , mappint : 'bankAccount' }
	] );
	
	var store = new Ext.data.Store({
		proxy : new Ext.data.HttpProxy({ url : 'WizBuyerInfoAction!toList.action' }),
		reader : reader
	});
	
	store.load();
	
	var grid = new Ext.grid.GridPanel({
		renderTo : 'div',
		store : store,
		cm : cm,
		width : 400,
		height : 300
	});
	
});