如何关闭Kendo下拉列表的缓存

var dataSource = new kendo.data.DataSource({
    transport: {
        read: {
            url: "data.json",
            cache: false // 关闭缓存
        }
    }
});

$("#dropdownlist").kendoDropDownList({
    dataSource: dataSource
});

$("#dropdownlist").kendoDropDownList({
    dataSource: {
        transport: {
            read: {
                url: "data.json",
                cache: false // 关闭缓存
            }
        }
    }
});

$.ajaxSetup({
    cache: false // 关闭缓存
});

$("#dropdownlist1").kendoDropDownList({
    dataSource: {
        transport: {
            read: {
                url: "data1.json"
            }
        }
    }
});

$("#dropdownlist2").kendoDropDownList({
    dataSource: {
        transport: {
            read: {
                url: "data2.json"
            }
        }
    }
});