jquery获取数据并生成下拉菜单

jquery获取数据并生成下拉菜单,

<script type="text/javascript">
    $(document).ready(function() {
        GetByJquery();
        $("#ddlProvince").change(function() { GetCity() });
        $("#ddlCity").change(function() { GetDistrict() });
    });
   
    function GetByJquery() {

        $("#ddlProvince").empty(); //清空省份SELECT控件

        $.getJSON("/ajax/GetProvinceList", function(data) {
            $.each(data, function(i, item) {
                $("<option></option>")
                    .val(item["ProvinceID"])
                    .text(item["ProvinceName"])
                    .appendTo($("#ddlProvince"));
            });
            GetCity();
        });     

    }

    function GetCity() {

        $("#ddlCity").empty(); //清空城市SELECT控件
        var url ="/ajax/GetCityList/" + $("#ddlProvince").val();
        $.getJSON(url, function(data) {
            $.each(data, function(i, item) {
                $("<option></option>")
                    .val(item["CityID"])
                    .text(item["CityName"])
                    .appendTo($("#ddlCity"));
            });
            GetDistrict();
        });
    }

    function GetDistrict() {
        $("#ddlDistrict").empty(); //清空市区SELECT控件
        var url = "/ajax/GetDistrictList/" + $("#ddlCity").val();
       
        $.getJSON(url, function(data) {
            $.each(data, function(i, item) {
                $("<option></option>")
                    .val(item["DistrictID"])
                    .text(item["DistrictName"])
                    .appendTo($("#ddlDistrict"));
            });
        });
    }

</script>