<script type="text/javascript">

    $(function () {

        $("#username").blur(function () {

           

            var username = document.getElementById('username').value;

            $.ajax({

                //要用post方式      

                type: "Post",

                //方法所在页面和方法名      

                url: "Login.aspx/Ziwu",

                data: "{'Username':'" + username + "'}",

                contentType: "application/json; charset=utf-8",

                dataType: "json",

                success: function (data) {

                    var distValue = data.d;

                    var distQL = distValue.split('~');

                    for (var i = 0; i < distQL.length; i++) {

                        var subItem = new Array();

                        subItem = distQL[i].split("?");

                        var text = subItem[1];

                        var value = subItem[0];



                        document.getElementById('DropDownList1').add(new Option(text, value)); //绑定DropDownList的value值，text值

                    }

                    //返回的数据用data.d获取内容      

                    //alert(str);



                },