Jquery把获取到的input值转换成json

<!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>
  <title> jquery把获取到的input值转换成json</title>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
  <link rel="stylesheet" type="text/css" href="" />
  <style type="text/css">
  .box{width:500px;height:500px;border:1px solid #e5e5e5;}
  </style>
  <script type="text/javascript" src="jquery-1.7.1.min.js"></script>
 </head>
 <body>
  <div class="box">
        姓名：<input type="text" value="" name="username"  />  <br/><br/>
        年龄：<input type="text" value="" name="age" />  <br/><br/>
        生日：<input type="text" value="" name="birth" />  <br/><br/>
        城市：<input type="text" value="" name="city" />  <br/><br/>
        省份：<input type="text" value="" name="provicen" />  <br/><br/>
        性别：<input type="text" value="" name="sex" />  <br/><br/>
        <input type="button" value="提交" class="comment">
  </div>
  <script type="text/javascript">
    $(document).ready(function(){
        $(".comment").click(function(){
            parArr = {};
             var username = $('input[name=username]').val().replace(/(^\s*)|(\s*$)/g, "");
             parArr.username = username;
             var age = $('input[name=age]').val().replace(/(^\s*)|(\s*$)/g, "");
              parArr.age = age;
              var birth = $('input[name=birth]').val().replace(/(^\s*)|(\s*$)/g, "");
              parArr.birth = birth;
              var city = $('input[name=city]').val().replace(/(^\s*)|(\s*$)/g, "");
              parArr.city = city;
              var provicen = $('input[name=provicen]').val().replace(/(^\s*)|(\s*$)/g, "");
              parArr.provicen = provicen;
              var sex = $('input[name=sex]').val().replace(/(^\s*)|(\s*$)/g, "");
              parArr.sex = sex;
              var params = JSON.stringify(parArr);
              alert(params);
        });
    });
  </script>
 </body>
</html>