模仿模态框

html:

<!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>模态框</title>
    <link rel="stylesheet" href="zuoye.css" />
  </head>
  <body>
    <header>
      <h1 class="title">新手1314的博客</h1>
      <button onclick="show()">登录</button>
    </header>
    <div class="show">
      <div class="show-ad" onclick="close()"></div>
      <form action="" class="show-form">
        <fieldset style="display: grid; gap: 1em">
          <legend>用户登录</legend>
          <input type="text" name="user" placeholder="请输入用户名" />
          <input type="password" name="password" placeholder="请输入密码" />
          <button>登录</button>
        </fieldset>
      </form>
    </div>
    <script src="zuoye.js"></script>
  </body>
</html>

css样式：

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
header {
  background-color: aqua;
  padding: 0.5em 1em;
  display: flex;
}
header .title {
  color: #fff;
  font-weight: lighter;
  letter-spacing: 3px;
  text-shadow: 1px 1px 1px #000;
}
header button {
  margin-left: auto;
  border: none;
  border-radius: 0.5em;
  width: 60px;
}
header button:hover {
  cursor: pointer;
  background-color: black;
  color: beige;
  transform: 0.5s;
  box-shadow: 0 0 5px #fff;
}
.show .show-form fieldset {
  background-color: blanchedalmond;
  border: 0;
  height: 16em;
  padding: 2em 3em;
  box-sizing: 0 0 5px #000;
}
.show .show-form fieldset legend {
  background-color: violet;
  color: #000;
  padding: 7px 1.5em;
}
.show .show-form fieldset input {
  font-size: 14px;
  padding-left: 1em;
  outline: none;
  border: 2px solid #fff;
  height: 3em;
}
.show .show-form fieldset input:focus {
  border: 0;
  box-shadow: 0 0 8px #888;
}
.show .show-form fieldset button {
  background-color: aqua;
  color: #000;
  border: 0;
  font-size: 16px;
  height: 2.5em;
}
.show .show-form fieldset button:hover {
  cursor: pointer;
  background-color: aquamarine;
}
.show .show-form {
  position: fixed;
  left: 50em;
  right: 50em;
  top: 10em;
}
.show .show-ad {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgb(0, 0, 0, 0.8);
}
.show {
  display: none;
}

js代码：

function show() {
  // 获取模态框元素
  const show = document.querySelector(".show");
  // 显示模态框
  show.style.display = "block";
  // 焦点自动置入第一个输入框email
  show.querySelector("input:first-of-type").focus();
}
function close() {
  // 获取模态框元素
  const show = document.querySelector(".show");
  // 关闭模态框
  show.style.display = "none";
}

html:

css样式：

js代码：

实现：

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