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<input type="radio" name="a" value="a1">
<input type="radio" name="a" value="a2">
<input type="radio" name="b" value="b1">
<input type="radio" name="b" value="b2">
<input type="radio" name="c" value="c1">
<input type="radio" name="c" value="c2">
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
.disabled {
opacity: 0.3;
filter:alpha(opacity=30);
}
</style>
</head>
<body>
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>
<div class="rb">
<input type="radio" name="a" value="a1">
<input type="radio" name="a" value="a2">
<input type="radio" name="b" value="b1">
<input type="radio" name="b" value="b2">
<input type="radio" name="c" value="c1">
<input type="radio" name="c" value="c2">
</div>
<script type="text/javascript">
$(function(){
var che = {};
var num = 0;
$(".rb").on("click", "input:not(.disabled)", function(event){
var n = $(this).attr("name");
var v = $(this).val();
if (che[n]==v) {
delete che[n];
num--;
$(this).prop("checked",false);
} else {
if (!(n in che))
num++;
che[n] = v;
}
$(".rb input").each(function(){
$(this).toggleClass("disabled", num>=2 && !($(this).attr("name") in che));
});
});
$(".rb").on("click", "input.disabled", function(event){
event.preventDefault();
alert("只能选择两项");
});
});
</script>
</body>
</html>
<div class="rb">
<input type="radio" name="a" value="a1">
<input type="radio" name="a" value="a2">
<input type="radio" name="b" value="b1">
<input type="radio" name="b" value="b2">
<input type="radio" name="c" value="c1">
<input type="radio" name="c" value="c2">
</div>
<script type="text/javascript">
$(function(){
var che = {};
var num = 0;
$(".rb input").click(function(event){
var n = $(this).attr("name");
var v = $(this).val();
if (che[n]==v) {
delete che[n];
num--;
$(this).prop("checked",false);
} else {
if (!(n in che))
num++;
che[n] = v;
}
$(".rb input").prop("disabled",function(){
return num>=2 && !($(this).attr("name") in che);
});
});
});
</script>