javascript – 如何绕过FormSpree重定向？

我在 Github Pages服务上获得了我的网站.我正在尝试实施FormSpree免费联系表单,但在您提交表单后,它会将您重定向到其他网站.我想避免的东西.所以我在互联网上查了一下,当然其他人也希望摆脱它(我在下图中省略了我的电子邮件).

这是我上面提到的形式,但它实际上根本不起作用.它在我试图摆弄它之前起作用了.

以下是FormSpree默认情况下的表单：

<form action="//formspree.io/your@email.com"
      method="POST">
    <input type="text" name="name">
    <input type="email" name="_replyto">
    <input type="submit" value="Send">
</form>

这是我的版本(在我尝试绕过重定向之前工作正常)

<div class=modal-body style="background-color: #454545">
    <p>Please use the form below to contact us regarding Feedback or any questions you may have!
        We will never use the information given below to spam you and we will never pass on your
        information to a 3rd party.</p>
    <p>As we are using <a target="_blank" href="http://formspree.io">FormSpree</a> for this form
    please consult their privacy policy for any questions regarding this matter.</p>
    <form id="contactform" method="POST">
        <div class="form-group">
            <div class="input-group">
                <span class="input-group-addon">Name</span>
                <input name="form-name-input" type="text" name="name" class="form-control" required>
            </div>
            <div class="input-group">
                <span class="input-group-addon">Email</span>
                <input name="form-email-input" type="email" name="_replyto" class="form-control" required>
            </div>
            <div class="input-group">
                <span class="input-group-addon">Subject</span>
                <input name="form-subject-input" type="text" name="subject" class="form-control" required>
            </div>
            <div class="input-group">
                <span class="input-group-addon">Description</span>
                <textarea name="form-description-input" name="description" class="form-control" rows="4" cols="60" required></textarea>
            </div>
            <input type="text" name="_gotcha" style="display:none" />
            <input class="btn btn-success" data-dismiss="modal" type="submit" id="form-submit-btn" value="Submit">
            <input type="hidden" name="_next" value="http://www.dynamicrealities.net" onclick="FormSentConfirmation()"/>
        </div>
        <script>
            var contactform =  document.getElementById('contactform');
            contactform.setAttribute('action','//formspree.io/' + 'dynamicrealities@gmail.com');
        </script>
    </form>
</div>
<div class="modal-footer" style="background-color: #333333">
    <button class="btn btn-danger btn-bg" data-dismiss="modal" type="button" id="form-dismiss-btn" onclick="">Close</button>
</div>

当我调用_next时,我希望它执行以下警报：

function FormSentConfirmation() {
    alert('Thanks for the email,we\'ll be in touch promptly.');
}

当我按下“提交”按钮时,所有发生的事情都是表格消失但我没有收到任何电子邮件.我可能只是做错了,因为我还不熟悉HTML / JavaScript.

$("#sendMessage").on("click",function() {
    $.ajax({
        url: "//formspree.io/dynamicrealities@gmail.com",method: "POST",data: {message: "hello!"},dataType: "json"
    });
});

var contactform =  document.getElementById('contactform');
contactform.setAttribute('action','//formspree.io/' + 'dynamicrealities@gmail.com