<input id="checkbox1" type="checkbox" checked>
<button onClick="aa()">查看选中结果</button>
<script language="JavaScript">
function aa(){
if (checkbox1.checked)
alert("已选中")
else
alert("未选中")
}
</script>
<button onClick="aa()">查看选中结果</button>
<script language="JavaScript">
function aa(){
if (checkbox1.checked)
alert("已选中")
else
alert("未选中")
}
</script>
<input type="button" value="checked?" onClick="key_1.checked?alert('yes'):alert('no');">
function a()
{
l=document.getElementsByName("key_1")
for(i=0;i<l.length;i++)
(l[i].checked)?alert(l[i].value):""
}