<script>
function CheckAll(obj)
{
alert(obj.checked)
for (var i=0;i<document.form1.tt1.length;i++)
{var temp=document.form1.tt1[i]; temp.checked = obj.checked;
}
}</script>
<form name=form1 action="1.php" method=post>
<input type=checkbox name="tt1" id=tt1 value=tt1 />
<input type=checkbox name="tt1" id=tt2 value=tt2 />
<input type=checkbox name="tt1" id=tt3 value=tt3 />
<input type=checkbox value="" id="all" onClick="CheckAll(this)">
<input type=submit value=submit>
</form>
function CheckAll(obj)
{
alert(obj.checked)
for (var i=0;i<document.form1.tt1.length;i++)
{var temp=document.form1.tt1[i]; temp.checked = obj.checked;
}
}</script>
<form name=form1 action="1.php" method=post>
<input type=checkbox name="tt1" id=tt1 value=tt1 />
<input type=checkbox name="tt1" id=tt2 value=tt2 />
<input type=checkbox name="tt1" id=tt3 value=tt3 />
<input type=checkbox value="" id="all" onClick="CheckAll(this)">
<input type=submit value=submit>
</form>
var temp = document.form1['tt1[]'][i];
if(obj.checked == true)
temp.checked = true; // form.chkall.checked;
else temp.checked =false ;
}
}只用html就可解决,不需要dhtml