ExtJS上拉框本地模糊搜索

 var converted4toos = new Ext.form.ComboBox({
        typeAhead: true,
        triggerAction: 'all',
        transform:'addrequire_business_charger',
         
        width:200,
         
		typeAheadDelay:5000,
		emptyText:'请选择业务负责人'
 });