JS实现的表格行鼠标点击高亮效果代码

<script type="text/javascript">var highlightcolor='#E0F2FE';var clickcolor='#ffedd2';function MouseOver(){ var source=event.srcElement;   if (source.tagName=="TD"){    source=source.parentElement;  var cells = source.children;   if (cells[0].style.backgroundColor!=highlightcolor&&cells[0].style.backgroundColor!=clickcolor)   for(i=0;i<cells.length;i++){    cells[i].style.backgroundColor=highlightcolor;   }   }}function MouseOut(){  var source=event.srcElement; if (source.tagName=="TD"){   source=source.parentElement;  var cells = source.children;   if (cells[0].style.backgroundColor!=clickcolor)    for(i=0;i<cells.length;i++){    cells[i].style.backgroundColor="";   }   }}function MouseClick(){ var source=event.srcElement; if (source.tagName=="TD"){   source=source.parentElement;  var cells = source.children;  if (cells[0].style.backgroundColor!=clickcolor)   for(i=0;i<cells.length;i++)    cells[i].style.backgroundColor=clickcolor;     else   for(i=0;i<cells.length;i++)    cells[i].style.backgroundColor="";  }}</script><table onmouseover="MouseOver()" onclick="MouseClick()" onmouseout="MouseOut()" cellspacing="0" bordercolordark="#ffffff" bordercolorlight="#cccccc" border="1" width="80%" align="center" style="cursor:pointer">  <tr>  <td>1</td>  <td>a</td>  <td>b</td>   </tr> <tr>  <td>2</td>  <td>c</td>  <td>d</td>   </tr> <tr>  <td>3</td>  <td>e</td>  <td>f </td>   </tr>  <tr>  <td>4</td>  <td>g</td>  <td>h </td>   </tr> </table>