C#后台代码怎么获取js中的集合变量

//全局变量，用于存取选中的日历
        var checkList = {};
        //获取选中的日历复选框
        function getCheck(checkName, hidName, chkAllName) {
            alert(document.getElementById(checkName).checked);
            var chek = document.getElementById(checkName);
            var hid = document.getElementById(hidName);
            if (chek.checked) {
                checkList[checkName] = hid.value;
            } else {
            document.getElementById(chkAllName).checked = false;
            checkList[checkName]=null;
              }
          }
          //关闭;
          function cls() {
              var win = document.getElementById("Panel1");
              win.style.display = "none";
          }
          //itemImage全选及全不选
          function _ChooseAllImage(sel, check) {
              var objtb = document.getElementById(sel);
              var num = objtb.getElementsByTagName("input");
              var check = document.getElementById(check);
              for (i = 0; i < num.length; i++) {
                  if (num[i].tagName == "INPUT") {
                      if (check.checked == true) {
                          if (num[i].type == "checkbox") {
                              if (num[i].checked != true) {
                                  num[i].checked = true;
                                  checkList[num[i].id]=num[i+1].value;
                              }
                          }
                      }
                      else {
                          num[i].checked = false;
                          checkList[num[i].id] = null;
                      }
                  }
              }
          }
    </script>