javascript留言板

用DOM相关方法创建的留言板
 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

 <style>

     #ul1 {margin:0; padding:0;}

     #ul1 li {list-style:none; width:300px; background:#CCC; border:1px solid #999; position:relative;}

     #ul1 li h2 {display:inline-block;}

     #ul1 li p {display:inline-block;}

     #ul1 li a {position:absolute; right:4px; bottom:4px;}

 </style>

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

     <title>无标题文档</title>

 <script type="text/javascript">

 window.onload=function (){

     var oName=document.getElementById('name');

     var oContent=document.getElementById('content');

     var oUl=document.getElementById('ul1');

     var oBtn=document.getElementById('btn1');

     var aLi=oUl.getElementsByTagName('li');

     var oLi=null;

     oBtn.onclick=function (){

         oLi=document.createElement('li');

         var oH2=document.createElement('h2');

         var oP=document.createElement('p');

         var oA=document.createElement('a');

         oH2.innerHTML=oName.value+'：';

         oP.innerHTML=oContent.value;

         oA.innerHTML='删除';

         oA.href='javascript:;';

         oA.onclick=function (){

             oUl.removeChild(this.parentNode);

         };

         oLi.appendChild(oH2);

         oLi.appendChild(oP);

         oLi.appendChild(oA);

         if(aLi.length>0){

             oUl.insertBefore(oLi, aLi[0]); //确保新添加的在最前面

         }

         else{

             oUl.appendChild(oLi);

         }

     };

 };

 </script>

 </head>

 <body>

 姓名：<input id="name" type="text" /><br />

 内容：<textarea id="content" rows="5" cols="40"></textarea><br />

 <input id="btn1" type="button" value="留言" />

 <ul id="ul1">

 </ul>

 </body>

 </html>