<input type ="checkbox" id="ck" onclick="javascript:aaa(this.checked);" />
<script language ="javascript" >
function aaa(checked)
{
if (checked)
{
document.getElementById ('txt').value="选中";
}
else
{
document.getElementById ('txt').value="未选中";
}
}
</script>
<script language ="javascript" >
function aaa(checked)
{
if (checked)
{
document.getElementById ('txt').value="选中";
}
else
{
document.getElementById ('txt').value="未选中";
}
}
</script>
if (document.getElementById ('ck').checked="true")
{.....
}