is的运用 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>判断是否被选中</title>
</head>
         <input type="checkbox" id="cr" /> <label for="cr">点击关联复选框</label>
         <br />
         <br />
         <input type="button" value="注册" />
<body>
        <script type="text/javascript" src="jquery-1.11.1.min.js"></script>
        <script type="text/javascript">
        $(function(){
                var reg = $('input:nth-of-type(2)');
                var cr = $('#cr');

                reg.click(function(event) {
                     if(cr.is(':checked')){
                        alert('完成注册');
                     }else{
                        alert('请勾选同意协议按钮');
                     }
                });
        })
        </script>
</body>
</html>

 

posted @ 2017-01-18 18:23  xuanPhoto  阅读(122)  评论(0)    收藏  举报