<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Checkbox1" name="all" type="checkbox" onclick="show()"/>全选/取消
<input id="Checkbox2" name="c1" type="checkbox" />1
<input id="Checkbox3" name="c1" type="checkbox" />2
<input id="Checkbox4" name="c1" type="checkbox" />3
<input id="Checkbox6" name="c1" type="checkbox" />4
<input id="Checkbox5" name="c1" type="checkbox" />5
</div>
</form>
</body>
<script>
function show()
{
//根据名字获取所有checkbox控件
var allCheckBoxs = document.getElementsByName("c1");
//半段点击了全选
if (document.getElementById("Checkbox1").checked == true) {
//循环让所有全选
for (var i = 0; i < allCheckBoxs.length ; i++) {
if (allCheckBoxs[i].type == "checkbox") {
allCheckBoxs[i].checked = true;
}
}
}
//点击了取消全选
else {
//循环取消全选
for (var i = 0; i < allCheckBoxs.length ; i++) {
if (allCheckBoxs[i].type == "checkbox") {
allCheckBoxs[i].checked = false;
}
}
}
}
</script>
</html>