楼梯导航案例

news2024/11/15 23:51:51

楼梯导航

在这里插入图片描述

<!DOCTYPE html>
<html lang="zh-cn">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>滚动到展示区</title>
  <link rel="stylesheet" href="css/reset.css">
  <style>
    .box {
      height: 400px;
      background-color: #368;
      margin: 10px;
      text-align: center;
      line-height: 400px;
      font-size: 80px;
      font-weight: 900;
      color: #fff;
    }


    .slide-nav {
      position: fixed;
      top: 300px;
      right: 0;
      height: 500px;
      width: 45px;
      background-color: #222;
      color: #fff;
    }

    .slide-nav li {
      font-size: 20px;
      line-height: 80px;
      text-align: center;
      border-bottom: 1px solid #fff;
      cursor: pointer;
      user-select: none;
    }
  </style>
</head>

<body>
  <div class="box">1</div>
  <div class="box">2</div>
  <div class="box">3</div>
  <div class="box">4</div>
  <div class="box">5</div>
  <div class="box">6</div>
  <ul class="slide-nav">
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
  </ul>
  <script src="js/common.js"></script>
  <script>
    var oNav = $('.slide-nav')
    var aBox = $$('.box')
    var timer
    oNav.addEventListener('click', function (e) {
      if(e.target.tagName.toLowerCase() === 'li') {
        scrollMove(aBox[e.target.innerText - 1], false)//true 与浏览器对其 false 居中
       
      }
    }, false)

    function scrollMove(ele, isTop) {
      var speed = 10
      var targetTop = ele.offsetTop
      var scrollTop
      isTop ?? true
      if(!isTop) {
        targetTop = (window.innerHeight - ele.offsetHeight) / 2 + ele.offsetTop
      }
      clearInterval(timer)
      timer = setInterval(function () {   
        var scrollTop = document.documentElement.scrollTop; 
        speed = (targetTop - scrollTop) / 10
        if(Math.abs(scrollTop - targetTop) < 10) {
          clearInterval(timer)
          document.documentElement.scrollTop = targetTop
          return false
        }
        document.documentElement.scrollTop = scrollTop + speed
      }, 1000 / 10)
    }
  </script>
</body>

</html>