javascript进阶篇-9-22

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<!DOCTYPE html>
<html>
 <head>
  <title> new document </title>  
  <meta http-equiv="Content-Type" content="text/html; charset=gbk"/>   
  <script type="text/javascript">  
     window.onload = function(){
        Highlight();
     }  
     function addOne(obj){ 
        var tbody = document.getElementById('table').lastChild;  
        var tr = document.createElement('tr');  

         var td = document.createElement("td");
         td.innerHTML = "<input type='text'/>";
         tr.appendChild(td);

         td = document.createElement("td");  
         td.innerHTML = "<input type='text'/>";
         tr.appendChild(td);

         td = document.createElement("td"); 
         td.innerHTML = "<a href='javascript:;' onclick='deleteRow(this)'>删除</a>";
         tr.appendChild(td);   

         tbody.appendChild(tr);   
        Highlight();
     }

     function deleteRow(obj){
        var tbody = document.getElementById('table').lastChild;  
        var tr = obj.parentNode.parentNode;
         tbody.removeChild(tr);
     }
     function Highlight(){
        var tbody = document.getElementById('table').lastChild; 
        trs = tbody.getElementsByTagName('tr');   
        for(var i =1;i<trs.length;i++){
            trs[i].onmouseover = function(){
                this.style.backgroundColor ="#f2f2f2";
            } 
            trs[i].onmouseout = function(){
                this.style.backgroundColor ="#fff";
            } 
        }  
     }

  </script> 
 </head> 
 <body> 
       <table border="1" width="50%" id="table">
       <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>操作</th>
       </tr>  

       <tr>
        <td>xh001</td>
        <td>王小明</td>
        <td><a href="javascript:;" onclick="deleteRow(this)">删除</a></td>
       </tr>

       <tr>
        <td>xh002</td>
        <td>刘小芳</td>
        <td><a href="javascript:;" onclick="deleteRow(this)">删除</a></td>
       </tr>  

       </table>
       <input type="button" value="添加一行" onclick="addOne()" />
 </body>
</html>