单击提交按钮后关闭Modal (ajax成功)

<!-- 模态框 -->
<div id="myModal" class="modal">
  <div class="modal-content">
    <span class="close">&times;</span>
    <p>这是一个模态框。</p>
    <button id="submitBtn">提交</button>
  </div>
</div>

<!-- 提交按钮 -->
<button id="openModalBtn">打开模态框</button>

// 获取模态框和提交按钮的元素
var modal = document.getElementById("myModal");
var submitBtn = document.getElementById("submitBtn");

// 获取关闭按钮的元素
var closeBtn = document.getElementsByClassName("close")[0];

// 点击提交按钮时关闭模态框
submitBtn.addEventListener("click", function() {
  modal.style.display = "none";
});

// 点击关闭按钮时关闭模态框
closeBtn.addEventListener("click", function() {
  modal.style.display = "none";
});

// 点击打开模态框按钮时显示模态框
document.getElementById("openModalBtn").addEventListener("click", function() {
  modal.style.display = "block";
});