W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function bgChange(bg) { document.body.style.background=bg } </script> </head> <body> <b>请把鼠标移动到正方形上，背景颜色会发生改变！</b> <table width="300" height="100"> <tr> <td onmouseover="bgChange('red')" onmouseout="bgChange('transparent')" bgcolor="red"> </td> <td onmouseover="bgChange('blue')" onmouseout="bgChange('transparent')" bgcolor="blue"> </td> <td onmouseover="bgChange('green')" onmouseout="bgChange('transparent')" bgcolor="green"> </td> </tr> </table> </body> </html>
查看结果: