ExtJs combobox模糊匹配

listeners : {
    beforequery : function(e) {  
        var combo = e.combo;     
        if(!e.forceAll){     
            var value = e.query;     
            combo.store.filterBy(function(record, id){     
                var text = record.get(combo.displayField);     
                return (text.indexOf(value)!=-1);     
            });  
            combo.expand();     
            return false;     
        }  
    }  
},