javascript is case-sensitive, also, you need to put your colors in quotes,for example:
<table>
<tr><td>
  <table>
   <tr onmouseover="this.style.backgroundColor='white'"
      onmouseout="this.style.backgroundColor='blue'"><td>afdasfasfasfasfasfasfasf</td></tr>
   <tr onmouseover="this.style.backgroundColor='white'"
      onmouseout="this.style.backgroundColor='blue'"><td>afgsdfythjutfgfjgfhjgfjh</td></tr>
  </table>
</td></tr>
<tr><td>
 adfasfasfasfasfasfasdfasf
</td></tr>
</table>

解决方案 »

  1.   

    <script language="javascript">
    function mouseOver(e){
        e.style.backgroundColor = 'white';
    }function mouseOut(e){
        e.style.backroundColor = 'white';
    }
    </script>
    <table>
    <tr><td>
      <table>
       <tr onmouseover="mouseOver(this)"
          onmouseout="mouseOut(this)"><td>afdasfasfasfasfasfasfasf</td></tr>
       <tr onmouseover="mouseOver(this)"
          onmouseout="mouseOut(this)"><td>afgsdfythjutfgfjgfhjgfjh</td></tr>
      </table>
    </td></tr>
    <tr><td>
     adfasfasfasfasfasfasdfasf
    </td></tr>
    </table>
      

  2.   

    呵呵... 用 style.background 不行的.. 下面这个可以了.<table>
    <tr><td>
      <table>
       <tr onmouseover="this.bgColor='green'"
          onmouseout="this.bgColor='blue'"><td>afdasfasfasfasfasfasfasf</td></tr>
       <tr onmouseover="this.style.backgroundcolor='white'"
          onmouseout="this.style.backgroundcolor='blue'"><td>afgsdfythjutfgfjgfhjgfjh</td></tr>
      </table>
    </td>
    </tr>
    <tr>
    <td>
     adfasfasfasfasfasfasdfasf
    </td>
    </tr>
    </table>
      

  3.   

    <tr onmouseover="this.style.background='#Caeaff';this.style.color='#000000'" 
                    onmouseout="this.style.background='';this.style.color=''" > 
              <td align="center"><a href="mouse.html">|-鼠标特效-|</a></td>
            </tr>