解析Jquery的LigerUI如何实现文件上传

      var AppendBillPathDetail = null;
      function f_selectAppendBillPath_1() {
          var imageurl = $(“#AppendBill”).val();
          var AppendBill_Id = $(“#AppendBill”).val();  // 单号
          if (imageurl.length == 0) {
              LG.showError(“您没有输入单号，请输入随单号！”);
              return;
          }
          if (AppendBillPathDetail) {
              AppendBillPathDetail.show();
          }
          else {
              AppendBillPathDetail = $.ligerDialog.open({
                  target: $(“#AppendBill_Div”), title: ‘添加图标’,
                  width: 360, height: 170, top: 170, left: 280,  // 弹出窗口大小
                  buttons: [
                      { text: ‘上传’, onclick: function () { AppendBillPath_save(); } },
                      { text: ‘取消’, onclick: function () { AppendBillPathDetail.hide(); } }
                      ]
              });
          }
      }
      function AppendBillPath_save()
      {
           var imgurl = $(“#fileupload”).val();
           // var filehelpcode = $(“#filehelpcode”).val();
          var extend = imgurl.substring(imgurl.lastIndexOf(“.”), imgurl.length);
          extend = extend.toLowerCase();
          if (extend == “.jpg” || extend == “.jpeg” || extend == “.png” || extend == “.gif” || extend == “.bmp”)