菜鸟求助
我想当我下拉框选择不同时，文本框前面的值改变，它label的值就是不变。
 function selectss() {
  var params1=document.getElementById("params1");
  var params2=document.getElementById("params2");
  var a = document.getElementById("eName");
  a.options[a.selectedIndex].selected == true;
  //alert(a.options[a.selectedIndex].value)
  if (a.options[a.selectedIndex].value=="ticket"){
   
  params1.style.display = "";
  params1.label=="车票数量";
  }  
  else if (a.options[a.selectedIndex].value == "question"){
  params1.style.display = "";
  params2.style.display = ""
  }
  else if(a.options[a.selectedIndex].value == "friend"){
  params1.style.display = "";
  params1.label="好友个数";
  }
  else{
  params1.style.display = "none";
  params2.style.display = "none"
  }
  }
  </script>


 <tr class="prop" id="params1" style="display:none">
  <td valign="top" class="name">
  <label for="params1"><g:message code="gameTask.params1.label" default="Params1"/></label>
  </td>
  <td valign="top" class="value ${hasErrors(bean: gameTaskInstance, field: 'params1', 'errors')}">
  <g:textField name="params1" value="${fieldValue(bean: gameTaskInstance, field: 'params1')}"/>
  </td>
  </tr>


  <tr id="params2" class="prop" style="display:none">
  <td valign="top" class="name">
  <label for="params2"><g:message code="gameTask.params2.label" default="Params2"/></label>
  </td>
  <td valign="top" class="value ${hasErrors(bean: gameTaskInstance, field: 'params2', 'errors')}">
  <g:textField name="params2" value="${fieldValue(bean: gameTaskInstance, field: 'params2')}"/>
  </td>
  </tr>

------解决方案--------------------
ID名设置为params1，params2试试