轮播图

最简单的轮播图编写方式，完全js书写 静态图如下：【有机会附上动态图】 主要有定时器进行自动播放功能以及按钮控制图片和文字转动效果

css代码

<style>
    * {
      box-sizing: border-box;
    }

    .slider {
      width: 560px;
      height: 400px;
      overflow: hidden;
    }

    .slider-wrapper {
      width: 100%;
      height: 320px;
    }

    .slider-wrapper img {
      width: 100%;
      height: 100%;
      display: block;
    }

    .slider-footer {
      height: 80px;
      background-color: rgb(100, 67, 68);
      padding: 12px 12px 0 12px;
      position: relative;
    }

    .slider-footer .toggle {
      position: absolute;
      right: 0;
      top: 12px;
      display: flex;
    }

    .slider-footer .toggle button {
      margin-right: 12px;
      width: 28px;
      height: 28px;
      appearance: none;
      border: none;
      background: rgba(255, 255, 255, 0.1);
      color: #fff;
      border-radius: 4px;
      cursor: pointer;
    }

    .slider-footer .toggle button:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    .slider-footer p {
      margin: 0;
      color: #fff;
      font-size: 18px;
      margin-bottom: 10px;
    }

    .slider-indicator {
      margin: 0;
      padding: 0;
      list-style: none;
      display: flex;
      align-items: center;
    }

    .slider-indicator li {
      width: 8px;
      height: 8px;
      margin: 4px;
      border-radius: 50%;
      background: #fff;
      opacity: 0.4;
      cursor: pointer;
    }

    .slider-indicator li.active {
      width: 12px;
      height: 12px;
      opacity: 1;
    }
  </style>

html代码

<div class="slider">
    <div class="slider-wrapper">
      <img src="./images/slider01.jpg" alt="" />
    </div>
    <div class="slider-footer">
      <p>对人类来说会不会太超前了？</p>
      <ul class="slider-indicator">
        <li class="active"></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
      </ul>
      <div class="toggle">
        <button class="prev">&lt;</button>
        <button class="next">&gt;</button>
      </div>
    </div>
  </div>

js代码

<script>
    // 1. 初始数据
    const sliderData = [{
        url: './images/slider01.jpg',
        title: '对人类来说会不会太超前了？',
        color: 'rgb(100, 67, 68)'
      },
      {
        url: './images/slider02.jpg',
        title: '开启剑与雪的黑暗传说！',
        color: 'rgb(43, 35, 26)'
      },
      {
        url: './images/slider03.jpg',
        title: '真正的jo厨出现了！',
        color: 'rgb(36, 31, 33)'
      },
      {
        url: './images/slider04.jpg',
        title: '李玉刚：让世界通过B站看到东方大国文化',
        color: 'rgb(139, 98, 66)'
      },
      {
        url: './images/slider05.jpg',
        title: '快来分享你的寒假日常吧~',
        color: 'rgb(67, 90, 92)'
      },
      {
        url: './images/slider06.jpg',
        title: '哔哩哔哩小年YEAH',
        color: 'rgb(166, 131, 143)'
      },
      {
        url: './images/slider07.jpg',
        title: '一站式解决你的电脑配置问题！！！',
        color: 'rgb(53, 29, 25)'
      },
      {
        url: './images/slider08.jpg',
        title: '谁不想和小猫咪贴贴呢！',
        color: 'rgb(99, 72, 114)'
      },
    ]
    const slider = document.querySelector('.slider')
    const prev = document.querySelector('.toggle .prev')
    const next = document.querySelector('.toggle .next')
    const footer = document.querySelector('.slider-footer')
    const p = document.querySelector('.slider-footer p')
    const img = document.querySelector('.slider-wrapper img')
    let i = 0
    // 自动播放
    //下面有调用的自动播放，这一段代码将不再需要
    // const timer = setInterval(function () {
    //   i++
    //   img.src = sliderData[i].url
    //   p.innerHTML = sliderData[i].title
    //   footer.style.background = sliderData[i].color
    //   document.querySelector('.slider-indicator .active').classList.remove('active')
    //   document.querySelector(`.slider-indicator li:nth-child(${i+1})`).classList.add('active')
    //   if (i === 7) {
    //     i = -1
    //   }
    // }, 1000)
    let timer = setInterval(function () {
      next.click()
    }, 1000)
    //点击进行前一张图片的播放
    prev.addEventListener('click', function () {
      i--
      if (i < 0) {
        i = 7
      }
      img.src = sliderData[i].url
      p.innerHTML = sliderData[i].title
      footer.style.background = sliderData[i].color
      document.querySelector('.slider-indicator .active').classList.remove('active')
      document.querySelector(`.slider-indicator li:nth-child(${i+1})`).classList.add('active')

    })
    //鼠标进入先停止自动播放功能
    slider.addEventListener('mouseenter', function () {
      clearInterval(timer)
    })
    //鼠标进入以防图片自动播放速度变快，可以先停止之前的再开启新的定时器
    slider.addEventListener('mouseleave', function () {
      clearInterval(timer)
      timer = setInterval(function () {
        next.click()
      }, 1000)
    })
     //点击进行后一张图片的播放
    next.addEventListener('click', function () {
      i++
      if (i > 7) {
        i = 0
      }
      img.src = sliderData[i].url
      p.innerHTML = sliderData[i].title
      footer.style.background = sliderData[i].color
      document.querySelector('.slider-indicator .active').classList.remove('active')
      document.querySelector(`.slider-indicator li:nth-child(${i+1})`).classList.add('active')
    })
  </script>