<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>jquery form序列化转换为json对象</title>
    <script src="//cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script>
    </script>
  </head>
  <body>
    <form action="" name="post_form" id="post_form">
      姓名：<input type="name" name="name" value="王">
      <br/>性别：<input type="radio" name="sex" value="男" checked>男<input type="radio" name="sex" value="女">女
      <br/>爱好：<input type="checkbox" name="loves" value="篮球" >篮球<input type="checkbox" name="loves" value="足球">足球
      <br/>籍贯：<select name="province">
              <option value="上海">上海</option>
              <option value="北京">北京</option>
              <option value="深圳">深圳</option>
            </select>
    </form>
    <div id="result" style="margin-top:20px;width:600px;height:100px;border:1px solid #f00;">
    </div>
    <div>
    <button id="send">发送</button>
    </div>
    <script>
    //jquery form序列化转换为json对象
    (function($){
      $.fn.serializeJson=function(){
        var serializeObj={};
        var array=this.serializeArray();
        var str=this.serialize();
        $(array).each(function(){
          if(serializeObj[this.name]){
            if($.isArray(serializeObj[this.name])){
              serializeObj[this.name].push(this.value);
            }else{
              serializeObj[this.name]=[serializeObj[this.name],this.value];
            }
          }else{
            serializeObj[this.name]=this.value;
          }
        });
        return serializeObj;
      };
    })(jQuery);
    $(document).ready(function(){
      $("#send").click(function(){
        var post_data=$("#post_form").serializeJson();//表单序列化
        $("#result").html(JSON.stringify(post_data));
      })
    })
    </script>
  </body>
</html>

 运行结果：