复制代码代码如下：
<html>
<头>
<title>制作全选效果</title>
<脚本语言=“ javascript”>
函数selectall（）{
allCheckBoxs = document.getElementsByname（“ a”）;
var a2 = document.getElementsByname（“ a1”）;
if（a2 [0] .checked）{
for（var i = 0; i <allcheckboxs.length; i ++）{
allcheckboxs [i] .checked = true;
}
}别的{
for（var i = 0; i <allcheckboxs.length; i ++）{
AllCheckBoxs [i] .checked = false;
}
}
}
</script>
</head>
<身体>
<form name =“ myform”>
<表>
<tr> <td colspan =“ 2”> <img src =“ images/head.jpg”/> </> </td> </tr>
<tr>
<td> <input type =“复选框” name =“ a1” onclick =“ selectall（）”/>全选/全不选</td>
<td> <img src =“ images/top.jpg”/> </td>
</tr>
<tr> <td> <input type =“复选框” name =“ a”/> </td> <td> <img src =“ images/one.jpg”/> </> </td> </td> </tr>
<tr> <td> <input type =“复选框” name =“ a”/> </td> <td> <img src =“ images/tw.jpg”/> </> </td> </td> </tr>
<tr> <td> <input type =“复选框” name =“ a”/> </td> <td> <img src =“ images/trimage/trimage/trimage”/> </> </td> </tr> </tr>
<tr> <td> <input type =“复选框” name =“ a”/> </td> <td> <img src =“ images/four.jpg”/> </> </td> </tr> </tr>
</table>
</form>
</body>
</html>