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我是 html 的初学者，我想学习。三天前我开始了我的 html 之旅，我遇到了一个问题......

所以，我在我的页面上创建了一个“黑暗模式”主题并且它正在工作。

我的问题是：当我单击 时Theme button，我想更改搜索栏颜色和文本，但我不知道该怎么做。

基本上，当我单击将Theme button主题更改为深色模式时，我希望搜索栏将背景颜色更改为#121212，文本颜色更改为white.

当我重新单击Theme button并返回灯光模式时，撤消这些操作，但我不知道如何操作。

先感谢您。

    <!DOCTYPE html>
    <html>
    <head>
    <title>Test</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Raleway">
    
    <style>
    body {
      background-color: white;
      color: #369497;
      transition: 0.5s;
    }
    
    .dark-mode {
      background-color: #121212;
      color: white;
      transition: 0.5s;
    }
    
    .button {
      display: inline-block;
      border-radius: 4px;
      background-color: #369497;
      border: none;
      color: white;
      text-align: center;
      font-size: 18px;
      padding: 12px;
      width: 120px;
      transition: all 0.5s;
      cursor: pointer;
      margin: 10px;
    }
    
    .button-pos {
      margin: 0;
      position: absolute;
      bottom: 0%;
      right: 0%;
      transform: translate(-20%, -15%);
    }
    
    .button span {
      cursor: pointer;
      display: inline-block;
      position: relative;
      transition: 0.5s;
    }
    
    .button span:after {
      content: '\00bb';
      position: absolute;
      opacity: 0;
      top: 0;
      right: -20px;
      transition: 0.5s;
    }
    
    .button:hover span {
      padding-right: 25px;
    }
    
    .button:hover span:after {
      opacity: 1;
      right: 0;
    }
    
    input[type=text] {
      width: 480px;
      box-sizing: border-box;
      border: 2px solid #369497;
      border-radius: 4px;
      font-size: 16px;
      background-color: white;
      padding: 12px 20px 12px 10px;
    }
    
    .searchbar-pos {
      margin: 0;
      position: absolute;
      top: 25%;
      left: 25%;
    }
    
    </style>
    </head>
    
    <body>
    <div class="bgimg w3-display-container w3-animate-opacity">
    <div class="w3-display-topmiddle">
    <img src="logo" alt="logo">
    </div>
    </div>
    
    <div class="bgimg w3-display-container w3-animate-opacity">
      <div class="w3-display-topleft w3-padding-large w3-xlarge">
        Logo
      </div>
    </div>
    
    <script>
    function myFunction() {
       var element = document.body;
       element.classList.toggle("dark-mode");
    }
    </script>
    
    <div class="w3-animate-opacity">
    <div class="button-pos">
    <button onclick="myFunction()" class="button" style="vertical-align:middle"><span>Theme </span></button>
    </div>
    </div>
    
    <div class="searchbar-pos">
    <form>
      <input type="text" name="search" placeholder="Search...">
    </form>
    </div>
    
    </body>
    </html>

4

1 回答 1

0

您必须为此编写一个 css 规则，基本上是在应用input了类的父元素时覆盖样式的东西dark-mode（body在这种情况下）。

您所需要的只是将其添加到您的 css 中：

.dark-mode input[type=text] {
  background-color: #121212;
  color: white;
}

这是您进行更改的代码： 

<!DOCTYPE html>
<html>

<head>
  <title>Test</title>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Raleway">

  <style>
    body {
      background-color: white;
      color: #369497;
      transition: 0.5s;
    }
    
    .dark-mode {
      background-color: #121212;
      color: white;
      transition: 0.5s;
    }
    
    .button {
      display: inline-block;
      border-radius: 4px;
      background-color: #369497;
      border: none;
      color: white;
      text-align: center;
      font-size: 18px;
      padding: 12px;
      width: 120px;
      transition: all 0.5s;
      cursor: pointer;
      margin: 10px;
    }
    
    .button-pos {
      margin: 0;
      position: absolute;
      bottom: 0%;
      right: 0%;
      transform: translate(-20%, -15%);
    }
    
    .button span {
      cursor: pointer;
      display: inline-block;
      position: relative;
      transition: 0.5s;
    }
    
    .button span:after {
      content: '\00bb';
      position: absolute;
      opacity: 0;
      top: 0;
      right: -20px;
      transition: 0.5s;
    }
    
    .button:hover span {
      padding-right: 25px;
    }
    
    .button:hover span:after {
      opacity: 1;
      right: 0;
    }
    
    input[type=text] {
      width: 480px;
      box-sizing: border-box;
      border: 2px solid #369497;
      border-radius: 4px;
      font-size: 16px;
      background-color: white;
      padding: 12px 20px 12px 10px;
    }
    
    .dark-mode input[type=text] {
      background-color: #121212;
      color: white;
    }
    
    .searchbar-pos {
      margin: 0;
      position: absolute;
      top: 25%;
      left: 25%;
    }
  </style>
</head>

<body>
  <div class="bgimg w3-display-container w3-animate-opacity">
    <div class="w3-display-topmiddle">
      <img src="logo" alt="logo">
    </div>
  </div>

  <div class="bgimg w3-display-container w3-animate-opacity">
    <div class="w3-display-topleft w3-padding-large w3-xlarge">
      Logo
    </div>
  </div>

  <script>
    function myFunction() {
      var element = document.body;
      element.classList.toggle("dark-mode");
    }
  </script>

  <div class="w3-animate-opacity">
    <div class="button-pos">
      <button onclick="myFunction()" class="button" style="vertical-align:middle"><span>Theme </span></button>
    </div>
  </div>

  <div class="searchbar-pos">
    <form>
      <input type="text" name="search" placeholder="Search...">
    </form>
  </div>

</body>

</html>

于 2021-01-30T21:52:31.100 回答