lovecoding
/
VIP30


			
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							<!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>Document</title>
  <link rel="stylesheet" href="./icon/iconfont.css">
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    ul {
      list-style: none;
    }

    #container {
      width: 590px;
      height: 470px;
      margin: 100px auto;
      position: relative;
    }

    .selected {
      display: none;
    }

    .choice {
      display: block;
    }

    #btns {
      position: absolute;
      right: 10px;
      bottom: 10px;
    }

    #btns li {
      width: 20px;
      height: 20px;
      border-radius: 10px;
      background: aqua;
      text-align: center;
      line-height: 20px;
      color: white;
      float: left;
      margin-right: 5px;
    }

    #btns .select {
      background: red;
    }

    #next,
    #prev {
      width: 40px;
      height: 40px;
      position: absolute;
      top: 215px;
      opacity: 0.4;
      display: none;
    }

    #next {
      right: 0;
    }

    #next span {
      font-size: 40px;
    }

    #prev span {
      font-size: 40px;
    }
  </style>
</head>

<body>
  <div id="container">
    <div id="img-box">
      <img class="selected choice" src="image/1.jpg" alt="">
      <img class="selected" src="image/2.jpg" alt="">
      <img class="selected" src="image/3.jpg" alt="">
      <img class="selected" src="image/4.jpg" alt="">
      <img class="selected" src="image/5.jpg" alt="">
    </div>
    <ul id="btns">
      <li class="select">1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
    </ul>
    <div id="next">
      <span class="iconfont icon-next"></span>
    </div>
    <div id="prev">
      <span class="iconfont icon-prev"></span>
    </div>
  </div>
  <script>
    var btns = document.getElementsByTagName('li') //类数组
    var imgs = document.getElementsByClassName('selected')
    var next = document.getElementById('next')
    var prev = document.getElementById('prev')
    var container = document.getElementById('container')

    //定义全局索引变量
    iNow = 0
    //想要给类数组绑定点击事件   我们需要利用循环
    for (var i = 0; i < btns.length; i++) {
      //创建一个属性 去把索引的值提取出来 
      //局部变量
      btns[i].index = i
      //btns[0].index = 0
      //btns[1].index = 1
      //给数组里面每一项都绑定点击事件
      btns[i].onclick = function () {
        // 一上来清除所有的样式  恢复到没有设置的时候
        for (var k = 0; k < btns.length; k++) {
          //按钮恢复
          btns[k].className = ''
          imgs[k].className = 'selected'
        }
        //谁的点击事件就是谁  
        // btns[0,1,2,3,4,5].className = 'select'
        //this = btns[点击的那个索引]
        this.className = 'select'
        //从上面换算一下   this.index = btns[点击的那个索引].index 
        //例子： 点击索引为2的按钮   this.index = btns[2].index  ---> btns[2].index = 2 
        imgs[this.index].className = 'selected choice'
        //赋值为当前的索引
        iNow = this.index
      }
    }
    //下一个点击事件
    next.onclick = function () {
      console.log(iNow)
      //当前的索引+1 ----->下一个
      iNow++;
      //当我们图片  索引+= 5  发现数组里面没有这么多个  变为空白 提醒报错
      //需要判断  如果 超出了  索引的最大值  变为索引为0 的图片
      if (iNow > btns.length - 1) {
        iNow = 0
      }
      // for (var k = 0; k < btns.length; k++) {
      //   btns[k].className = ''
      //   imgs[k].className = 'selected'
      // }
      // btns[iNow].className = 'select'
      // imgs[iNow].className = 'selected choice'

      //把方法提取出去  避免代码重复
      myFun(iNow)
    }
    //上一个点击事件
    prev.onclick = function () {
      iNow--;
      if (iNow < 0) {
        iNow = btns.length - 1
      }
      myFun(iNow)
    }
    //鼠标划入事件
    container.onmousemove = function () {
      next.style.display = 'block'
      prev.style.display = 'block'
      clearInterval(timer)
    }
    //鼠标划出事件
    container.onmouseout = function () {
      next.style.display = 'none'
      prev.style.display = 'none'
      //划出的时候 需要重新设定定时器  
      //不要var  var就相当于在这个函数里面 又创建了一个  定时器 同名  会同时触发
      //重新唤醒之前的定时器就可以
      timer = setInterval(function () {
        next.onclick()
      }, 1000)
    }

    //定时器
    //如果在这个页面里面 想要实现 定时下一个  就相当于 触发了 下一个的事件
    var timer = setInterval(function () {
      next.onclick()
    }, 1000)


    var myFun = function (xx) {
      for (var k = 0; k < btns.length; k++) {
        btns[k].className = ''
        imgs[k].className = 'selected'
      }
      //变得只是传进来的索引
      btns[xx].className = 'select'
      imgs[xx].className = 'selected choice'
    }
  </script>
</body>

</html>