<!--当点击相应按钮，执行相应操作，为按钮添加相应事件-->

    <input type="button" value="改变颜色"onclick="set.changeColor()" >  

    <input type="button" value="改变宽高"onclick="set.changeSize()" >

    <input type="button" value="隐藏内容"onclick="set.objHide()" >

    <input type="button" value="显示内容"onclick="set.objShow()" >

    <input type="button" value="取消设置"onclick="set.offSet()">

  </form>

  <script type="text/javascript">

var txt=document.getElementById("txt");

var set={

function changeColor()

{txt.style.color="blue";

txt.style.backgroundColor="#ccc";},

function changeSize()

{txt.style.width="600px";

txt.style.height="400px";},

function objHide()

{txt.style.display="none";},

function objShow()

{txt.style.display= "block";},

function offSet()

{var ans=confirm("是否取消？");

if (ans==true)

   { txt.removeAttribute("style");}

}

}

  </script>

</body>