<body>
<input type=checkbox name=mm value=a onclick="checkItem(this, 'mmAll')"><br>
<input type=checkbox name=mm value=b onclick="checkItem(this, 'mmAll')"><br>
<input type=checkbox name=mm value=c onclick="checkItem(this, 'mmAll')"><br>
<input type=checkbox name=mm value=d onclick="checkItem(this, 'mmAll')"><br>
<input type=checkbox name=mm value=e onclick="checkItem(this, 'mmAll')"><br><br>
<input type=checkbox name=mmAll onclick="checkAll(this, 'mm')">全選與不全選的切換
<input name='button1' type='button' value='全選' onClick='this.value=check("mm")'>
<script language="javascript">
var checkflag="false";
function check(field){
field = document.getElementsByName(field)
??????? if(checkflag=="false"){
??????????????? for(i=0;i<field.length;i++)
??????????????? {
??????????????????????? field[i].checked = true;
??????????????? }
??????????????? checkflag="true";
??????????????? return "反選";
??????? }
??????? else {
??????????????? for(i=0;i<field.length;i++)
??????????????? {
??????????????????????? field[i].checked = false;
??????????????? }
??????????????? checkflag="false";
??????????????? return "全選";
??????? }
}
</script>
<script language=Javascript>
function checkAll(e, itemName)
{
? var aa = document.getElementsByName(itemName);
? for (var i=0; i<aa.length; i++)
?? aa[i].checked = e.checked;
}
function checkItem(e, allName)
{
? var all = document.getElementsByName(allName)[0];
? if(!e.checked) all.checked = false;
? else
? {
??? var aa = document.getElementsByName(e.name);
??? for (var i=0; i<aa.length; i++)
???? if(!aa[i].checked) return;
??? all.checked = true;
? }
}
</script>
?
</body>
</html>