1.html

模态框

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>固定定位实战：模态框</title>
    <link rel="stylesheet" href="modal.css" />
  </head>
  <body>
    <header>
      <!-- 页眉 -->
      <h2>我的网站</h2>
      <button>登录</button>
    </header>
    <div class="modal">
      <!-- 半透明的蒙版遮罩盖住模态框弹层的后面内容 -->
      <div class="modal-backdrop"></div>
      <!-- 主体 -->
      <div class="modal-body">
        <!-- 关闭按钮 -->
        <button class="close">关闭</button>
        <form action="" method="POST">
          <table>
            <caption>
              用户登录
            </caption>
            <tr>
              <td><label for="usernamel">账号</label></td>
              <td><input type="username" name="usernamel" id="username" /></td>
            </tr>
            <tr>
              <td><label for="password">密码</label></td>
              <td><input type="password" name="password" id="password" /></td>
            </tr>
            <tr>
              <td><label for="email">邮箱</label></td>
              <td><input type="email" name="email" id="email" /></td>
            </tr>
            <tr>
              <td><button>登录</button></td>
            </tr>
          </table>
        </form>
      </div>
    </div>
    <script src="modal.js"></script>
  </body>
</html>

2 css

/* 初始化 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
/* 页眉 */
header {
  background-color: #dedede;
  padding: 0.5em 2em;
  overflow: hidden;
}
header h2 {
  float: left;
}
header button {
  float: right;
  width: 10em;
  height: 2.5em;
}
header button:hover {
  cursor: pointer;
  background-color: azure;
}
/* 模态框 */
/* 遮罩 */
.modal .modal-backdrop {
  /* 蒙版必须将弹层的后面全部盖住，意味着与容器大小一样 */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgb(0, 0, 0, 0.5);
}
/* 模态框主体 */
.modal .modal-body {
  border: 1px solid #000;
  padding: 1em;
  min-width: 20em;
  background-color: lightcyan;
  background: linear-gradient(to right, lightcyan, #fff);
  /* 将一个块在另一个块中垂直居中 */
  position: fixed;
  top: 5em;
  left: 30em;
  right: 30em;
}
.modal .modal-body form {
  width: 80%;
}
.modal .modal-body form caption {
  font-weight: bolder;
  margin-bottom: 1em;
}
.modal .modal-body form td {
  padding: 0.5em;
}
.modal .modal-body form table td:first-of-type {
  width: 5em;
}
.modal .modal-body form input {
  width: 20em;
  height: 2em;
}
.modal {
  position: relative;
}
.modal .modal-body .close {
  position: absolute;
  right: 1em;
  width: 4eem;
  height: 2em;
}
.modal button:hover {
  cursor: pointer;
  background-color: azure;
}
/* 当页面刚打开的时候，应该将弹窗隐藏 */
.modal {
  display: none;
}

3.js

const btn = document.querySelector("header button");
const modal = document.querySelector(".modal");
const close = document.querySelector(".close");
btn.addEventListener("click", setModal, false);
close.addEventListener("click", setModal, false);
function setModal(ev) {
  ev.preventDefault();
  let status = window.getComputedStyle(modal, null).getPropertyValue("display");
  modal.style.display = status === "none" ? "block" : "none";
}

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