jQuery-为ajax POST获取表单值

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我试图通过Ajax将表单值发布到php文件中。如何收集表单值以在“数据”参数内发送?

$.ajax({
        type: "POST",
        data: "submit=1&username="+username+"&email="+email+"&password="+password+"&passconf="+passconf,
        url: "http://rt.ja.com/includes/register.php",
        success: function(data)
        {   
            //alert(data);
            $('#userError').html(data);
            $("#userError").html(userChar);
            $("#userError").html(userTaken);
        }
    });

HTML:

<div id="border">
  <form  action="/" id="registerSubmit">
    <div id="userError"></div>
      Username: <input type="text" name="username" id="username" size="10"/><br>
      <div id="emailError" ></div>
      Email: <input type="text" name="email" size="10" id="email"/><br>
      <div id="passError" ></div>
      Password: <input type="password" name="password" size="10" id="password"/><br>
      <div id="passConfError" ></div>
      Confirm Password: <input type="password" name="passconf" size="10" id="passconf"/><br>
      <input type="submit" name="submit" value="Register" />
  </form>
</div>
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$("#registerSubmit").serialize() // returns all the data in your form
$.ajax({
     type: "POST",
     url: 'your url',
     data: $("#registerSubmit").serialize(),
     success: function() {
          //success message mybe...
     }
});

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