javascript应用：实现复选框全选/全不选切换
经常有人问起在网页里实现多选框的全选功能，今天我就写了这么一个DEMO<input type=checkbox name=mm value=a ><br>
<input type=checkbox name=mm value=b ><br>
<input type=checkbox name=mm value=c ><br>
<input type=checkbox name=mm value=d ><br>
<input type=checkbox name=mm value=e ><br><br>
<input type=checkbox name=mmAll >全选与不全选的切换
<script language=Javascript>
function checkAll(e, itemName)
{
var aa = document.getElementsByName(itemName);
for (var i=0; i<aa.length; i++)
aa.checked = e.checked;
}
function checkItem(e, allName)
{
var all = document.getElementsByName(allName);
if(!e.checked) all.checked = false;
else
{
var aa = document.getElementsByName(e.name);
for (var i=0; i<aa.length; i++)
if(!aa.checked) return;
all.checked = true;
}
}
</script>
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