<tr>
<td><span text="建材" value1="7" onclick ="checkProd(); "><input id="ctl00_ContentPlaceHolder1_cblParent_0" type="checkbox" name="ctl00$ContentPlaceHolder1$cblParent$0" /><label for="ctl00_ContentPlaceHolder1_cblParent_0">建材</label></span></td><td><span text="型钢" value1="14" onclick ="checkProd(); "><input id="ctl00_ContentPlaceHolder1_cblParent_1" type="checkbox" name="ctl00$ContentPlaceHolder1$cblParent$1" /><label for="ctl00_ContentPlaceHolder1_cblParent_1">型钢</label></span></td></tr>

 <script type="text/javascript">
          function checkProd() {
              // 再IE9和Chome下不能运行
              var lblProdSelected = document.getElementById("<%=lblProdSelected.ClientID %>");
              var hidProdSelected = document.getElementById("<%=hidProdSelected.ClientID %>");
              var ckelems = document.getElementById("<%=cblParent.ClientID %>").getElementsByTagName("input");
              var spelems = document.getElementById("<%=cblParent.ClientID %>").getElementsByTagName("span");
              for (var i = 0; i < ckelems.length; i++) {
                  if (ckelems[i].type == "checkbox") {
                      var nm = spelems[i].text;
                      var id = spelems[i].value1;
                      var text = lblProdSelected.innerText;
                      var t = nm + "|" + id + ",";
                      if (ckelems[i].checked) {
                          if (text == "") {
                              lblProdSelected.innerText += t;
                              hidProdSelected.value += t;
                          }
                          else {
                              if (text.indexOf(t) == -1) {
                                  //不包含则加入
                                  lblProdSelected.innerText += t;
                                  hidProdSelected.value += t;
                              }
                          }
                      }
                      else {
                          lblProdSelected.innerText = lblProdSelected.innerText.replace(t, "");
                          hidProdSelected.value = hidProdSelected.value.replace(t, "");
                      }
                  }
              }
          }
    </script>