Ext grid延迟选中checkbox

Ext.onReady(function() {var testData = [['1', 'xxxxx'], ['2', 'aaaa'], ['3', 'xxyyy'],['4', 'bbbb']];var selectValue = ['bbbb', 'aaaa']var store = new Ext.data.SimpleStore({fields : ['id', 'name']});var sm = new Ext.grid.RowSelectionModel({listeners : {'rowselect' : function(sm, rowIndex, r) {Ext.log("select", rowIndex, r.get('name'))}}});var grid = new Ext.grid.GridPanel({width : 800,height : 500,autoScroll : true,store : store,sm : sm,columns : [sm, {header : '序号',dataIndex : 'id',sortable : true}, {header : '名字',dataIndex : 'name',sortable : true}]});var v = new Ext.Viewport({items : [grid]});store.on('load', function(store, records, options) {var arr = [];for (var i = 0; i < records.length; i++) {var record = records[i];var isMatch = selectValue.indexOf(record.get('name')) != -1;if (isMatch) {arr.push(record);}}sm.selectRecords(arr);}, this, {delay : 1000})store.loadData(testData);});