css-components/switchButton.html at master · hwwgh555/css-components · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link href='./reset.css' rel="stylesheet">
  <title>开关按钮</title>
  <style>
    html,body{
      height: 100%;
    }
    body{
      display: flex;
      justify-content: center;
      align-items: center;
      align-content: center;
    }
    .switchButton{
      width: 80px;
      height: 40px;
      display: inline-block; /* 不写的话 span 不会在浏览器中显示*/
      position: relative;
      /* border: 1px solid #888; */
      background-color: #BDC3D1;
      border-radius: 40px;
      transition: all 0.2s ease-in-out;
      cursor: pointer;
    }
    .switchButton::after{
      content: '';
      height: 40px;
      width: 40px;
      border-radius: 50%;
      background-color: #fff;
      display: block; /*必须是 block 或是 inline-block，否则不显示，哪个更好呢？*/
      position: absolute;
      left: 1px; /*  left属性，就没有动画效果--- 为什么？*/
      box-shadow: 0 1px 3px #666666; /* 立体效果，大增 ！！*/
      transition: all 0.2s ease-in-out;
    }
    .switchButton.active::after{
      left: 39px;
    }
  </style>
  <script>
    window.onload = function () {
      const $switch = document.querySelector('#switch')
      const $button = document.querySelector('#button')
      $button.addEventListener('click', () => {
        console.log(this)
        const curClassname = $switch.getAttribute('class')
        if (curClassname.includes('active')) {
          $switch.setAttribute('class', 'switchButton')
        } else {
          $switch.setAttribute('class', 'switchButton active')
        }
      })
    }
  </script>
</head>
<body>
  <!--关键点：1.span的::after巧用 2.动画效果的关键 2.1 transition 2.2 left属性的前后对比 -->
  <span id="switch" class="switchButton" id="switch"></span>
  <span id="button">开关</span>
</body>
</html>