您应该启用 serverFiltering 为了让数据源每次都发出请求.

You should enable serverFiltering in order for the data source to make requests every time.

$('#autocomplete').kendoAutoComplete({
    minLength : 3,
    filter : "contains",
    dataValueField : "key",
    dataTextField : "value",
    dataSource : new kendo.data.DataSource({,
        serverFiltering: true, 
        transport : {
            read : _OnTransportRead
        },
        schema : {
            /* object schema */
        }
    })
});