<input type=checkbox name=mm value=a onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=b onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=c onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=d onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=e onclick="Item(this, 'mmAll')"><br><br>
<input type=checkbox name=mmAll onclick="All(this, 'mm')">全选与不全选的切换<script language=Javascript>
function All(e, itemName)
{
var aa = document.getElementsByName(itemName);
for (var i=0; i<aa.length; i++)
aa[i].checked = e.checked; //得到那个总控的复选框的选中状态
}
function Item(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>
<input type=checkbox name=mm value=b onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=c onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=d onclick="Item(this, 'mmAll')"><br>
<input type=checkbox name=mm value=e onclick="Item(this, 'mmAll')"><br><br>
<input type=checkbox name=mmAll onclick="All(this, 'mm')">全选与不全选的切换<script language=Javascript>
function All(e, itemName)
{
var aa = document.getElementsByName(itemName);
for (var i=0; i<aa.length; i++)
aa[i].checked = e.checked; //得到那个总控的复选框的选中状态
}
function Item(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>
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http://community.csdn.net/Expert/ForumList_Search.asp?searchtype=2&bigclassid=3&smallclassid=304&searchKeys=%C8%AB%D1%A1&author=&tabletype=now&Submit2=%B6%D4%D1%A1%D4%F1%B5%C4%D0%A1%C0%E0%BD%F8%D0%D0%CB%D1%CB%F7
{
if(document.getElementsByTagName("INPUT")[i].type && document.getElementsByTagName("INPUT")[i].type=="checkbox")document.getElementsByTagName("INPUT")[i].checked=true
}
for(i=0;i<document.getElementsByTagName("INPUT").length;i++)
{
if(document.getElementsByTagName("INPUT")[i].type && document.getElementsByTagName("INPUT")[i].type=="checkbox")document.getElementsByTagName("INPUT")[i].checked=true}
for(var i=0;i<form1.all.length;i++)
{
var e=form1.all[i];
if(e.type='checkbox')
e.checked=true;
}
<input type=checkbox name=All onclick="checkAll('mm')">全选<br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/><br/>
<input type=checkbox name=All2 onclick="checkAll('mm2')">全选<br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/></form><SCRIPT LANGUAGE="JavaScript">
function checkAll(str)
{
var a = document.getElementsByName(str);
var n = a.length;
for (var i=0; i<n; i++)
a[i].checked = window.event.srcElement.checked;
}
function checkItem(str)
{
var e = window.event.srcElement;
var all = eval("document.meizz."+ str);
if (e.checked)
{
var a = document.getElementsByName(e.name);
all.checked = true;
for (var i=0; i<a.length; i++)
{
if (!a[i].checked){ all.checked = false; break;}
}
}
else all.checked = false;
}
</SCRIPT>