Code<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>检查一组复选框是否选中</title>
<script language="javascript">
<!--
function check() {
var frm = document.form1.ch;
var length = frm.length;
var str = "";
for(i=0; i<length; i++) {
if(frm[i].checked) {
str += "第" + (i+1) + "项选中\n";
}
}
if(str == "") {
alert("你一项都没有选中");
} else {
alert(str);
}
}
//-->
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<label>
<input type="checkbox" name="ch" id="ch" />
第一项</label>
<label>
<input type="checkbox" name="ch" id="ch" />
第二项</label>
<label>
<input type="checkbox" name="ch" id="ch" />
第三项</label>
<label>
<input type="checkbox" name="ch" id="ch" />
第四项</label>
<label>
<input type="checkbox" name="ch" id="ch" />
第五项</label>
<input type="submit" value="检查" name="submit" onclick="check()">
</form>
</body>
</html>
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