<input type="checkbox" name="selectall" value=on onclick="selectAll()">
function selectAll(form) {
var obj = document.getElementsByName('selectall');
var cks = document.getElementsByTagName("input");
var ckslen = cks.length;
for(var i=0;i<ckslen-1;i++) {
if(cks[i].type == 'checkbox') {
cks[i].
checked = obj[0].checked;
}
}
}
<html>
<head>
<script>
function selectAll(){
var checklist = document.getElementsByName ("selected");
if(document.getElementById("controlAll").checked)
{
for(var i=0;i<checklist.length;i++)
{
checklist[i].checked = 1;
}
}else{
for(var j=0;j<checklist.length;j++)
{
checklist[j].checked = 0;
}
}
} // www.jb200.com
</script>
</head>
<body>
<form>
<input onclick="selectAll()" type="checkbox" name="controlAll" style="controlAll" id="controlAll"/>全选
1:<input type="checkbox" name="selected" value="1"/>
2:<input type="checkbox" name="selected" value="2"/>
3:<input type="checkbox" name="selected" value="3"/>
4:<input type="checkbox" name="selected" value="4"/>
5:<input type="checkbox" name="selected" value="5"/>
6:<input type="checkbox" name="selected" value="6"/>
</form>
<p>
以上代码实现了checkbox复选框的全选与全不选，供大家参考。
</p>
</body>
</html>
