按钮可不用不可用的问题
<input type="button" id="Button1"" />
  <input type="button" id="Button2" onclick="bbb()" />
  <input type="button" id="aa" onclick="aaa()" />
  <input type="text" id="bb" onchange="bbb()"/> 
  </div>
  </form>
  <script type="text/javascript">
  function aaa() {
  alert("123");
  document.getElementById("Button1").disabled = "false";
  }
  function bbb() {
  alert("1234");
  document.getElementById("Button1").disabled = "true";
  };
  </script>
为什么可以设置其为不可用户！但是要设置回来就不行了
 

------解决方案--------------------

JScript code

  function aaa() {
     alert("123");
      document.getElementById("Button1").disabled = "";
  }
  function bbb() {
      alert("1234");
      document.getElementById("Button1").disabled = "true";
  };