W3School TIY Editor

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {font-family: Arial, Helvetica, sans-serif;}

/* 模态框（背景） */
.modal {
  display: none; /* 默认隐藏 */
  position: fixed; /* 固定位置 */
  z-index: 1; /* 位于最上方 */
  left: 0;
  top: 0;
  width: 100%; /* 全宽 */
  height: 100%; /* 全高 */
  overflow: auto; /* 如果需要，启用滚动 */
  background-color: rgb(0,0,0); /* 备用颜色 */
  background-color: rgba(0,0,0,0.4); /* 带透明度的黑色 */
  -webkit-animation-name: fadeIn; /* 背景渐显 */
  -webkit-animation-duration: 0.4s;
  animation-name: fadeIn;
  animation-duration: 0.4s
}

/* 模态框内容 */
.modal-content {
  position: fixed;
  bottom: 0;
  background-color: #fefefe;
  width: 100%;
  -webkit-animation-name: slideIn;
  -webkit-animation-duration: 0.4s;
  animation-name: slideIn;
  animation-duration: 0.4s
}

/* 关闭按钮 */
.close {
  color: white;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}

.modal-header {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}

.modal-body {padding: 2px 16px;}

.modal-footer {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}

/* 添加动画 */
@-webkit-keyframes slideIn {
  from {bottom: -300px; opacity: 0} 
  to {bottom: 0; opacity: 1}
}

@keyframes slideIn {
  from {bottom: -300px; opacity: 0}
  to {bottom: 0; opacity: 1}
}

@-webkit-keyframes fadeIn {
  from {opacity: 0} 
  to {opacity: 1}
}

@keyframes fadeIn {
  from {opacity: 0} 
  to {opacity: 1}
}
</style>
</head>
<body>

<h2>底部模态框</h2>

<button id="myBtn">打开模态框</button>

<div id="myModal" class="modal">

<div class="modal-content">
    <div class="modal-header">
      <span class="close">×</span>
      <h2>模态框标题</h2>
    </div>
    <div class="modal-body">
      <p>模态框主体中的一些文本</p>
      <p>其他一些文本...</p>
    </div>
    <div class="modal-footer">
      <h3>模态框底部</h3>
    </div>
  </div>

</div>

// 获取打开模态框的按钮
var btn = document.getElementById("myBtn");

// 获取关闭模态框的 <span> 元素
var span = document.getElementsByClassName("close")[0];

// 当用户点击按钮时，打开模态框 
btn.onclick = function() {
  modal.style.display = "block";
}

// 当用户点击 <span> (x) 时，关闭模态框
span.onclick = function() {
  modal.style.display = "none";
}

// 当用户点击模态框外部的任何地方时，关闭模态框
window.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = "none";
  }
}
</script>

</body>
</html>