省市联动 js

工作中见到这个省市联动代码，虽然很简单也能写出来，还是随便把它记录下来。
//省市联动

        function area(obj_id, area_pId, data_call_back) {

            if (area_pId == -) return;

            $.ajax({

                type: 'GET',

                url: "/SysAdmin/Pages/tb_supplierAdd.aspx",

                data: { area_pId: area_pId },

                dataType: 'json',

                success: function (data) {

                    $("#" + obj_id + " option").remove();

                    //加默认记录

                    $("#" + obj_id).append("<option txt='请选择' value='-1'>请选择</opetion>");

                    for (var i = ; i < data.length; i++) {

                        $("#" + obj_id).append("<option txt='" + data[i].Value + "' value='" + data[i].Key + "'>" + data[i].Value + "</opetion>");

                    }

                    if (data_call_back)

                        data_call_back(data);

                },

                error: function () {

                    alert("异常！");

                }

            });

        }

        $(function () {

            $("#Provice").change(function () {

                area("City", $(this).children('option:selected').val());

            });

            area("Provice", );

            $("#City").append("<option value='-1' txt='请选择'>请选择</option>");

        });

    </script>

    <!--EndEdit1-->

</head>

<body>

    <form id="form1" runat="server">

        <%--<div style="padding: 10px;">

            <div style="float: left; margin-left: 10px;">

                <span>请选择省：</span><asp:DropDownList Width="" class="DropDownList form-control" ID="provice" placeholder="请选择省" runat="server"></asp:DropDownList>

            </div>

            <input id="Key" style="width: 30%" class="TextBox form-control" onkeydown="SearchKey(event);" placeholder="请输入供应商名称，按回车搜索" title="供应商名称,按回车" />

        </div>--%>

        <div style="margin:10px">

            <div style="float:left;width:200px">

                <span style="width:30%;float:left;padding-top:8px">请选择省：</span><asp:DropDownList class="form-control" ID="Provice" runat="server" Width="60%"></asp:DropDownList>

            </div>

            <div style="float:left;width:200px">

                <span style="width:30%;float:left;padding-top:8px">请选择市：</span><asp:DropDownList class="form-control" ID="City" runat="server" Width="60%"></asp:DropDownList>

            </div>

            <input type="text" style="height:34px;color:#555;margin-left:15px;margin-right:10px;width:250px" id="Key" class="TextBox"  placeholder="请输入供应商名称" />

            <button  class="btn btn-default w-l-fd" type="button" id="SearchBt"  onclick="Search()">确定</button>

        </div>
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