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A case study of JavaScript, html and css implementing floor-hopping page layout

黄舟Original: 2017-10-25 09:23:341588browse

Implementation code and comments:

<!DOCTYPE html>
<html>
<head>
  <title>楼层跳跃式的页面布局</title>
  <meta charset="utf-8">
  <style type="text/css">
    *{
      margin: 0;
      padding: 0;
    }
    body, html{
      height: 100%;
    }
    ul{
      list-style: none;
      height: 100%;
    }
    ul li{
      height: 100%;
    }
    ol{
      list-style: none;
      position: fixed;
      top:200px;
      left: 50px;
    }
    ol li{
      width: 50px;
      height: 50px;
      border: 1px solid #000;
      text-align: center;
      line-height: 50px;
      margin-top: -1px;
      cursor: pointer;
    }
  </style>
</head>
<body>
<ul>
  <li>第一区域</li>
  <li>第二区域</li>
  <li>第三区域</li>
  <li>第四区域</li>
</ul>
<ol>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
</ol>
<script type="text/javascript" src="myScroll.js"></script>
<script type="text/javascript">
  // 点击ol的li，屏幕滑动到对应的ul的li
  // 利用window.scrollTo()；缓动动画实现
  var ul = document.getElementsByTagName("ul")[0];
  var ol = document.getElementsByTagName("ol")[0];
  var ulLiArr = ul.children;
  var olLiArr = ol.children;
  var target = 0;
  var leader = 0;
  var timer = null;
  // 1. 指定ul和ol中li的背景色，对应li的背景色相同
  var arrColor = ["green","orange","yellow","red","gold"];
  // 利用for循环给两个数组中的元素上色
  for(var i=0; i<arrColor.length; i++){
    ulLiArr[i].style.backgroundColor = arrColor[i];
    olLiArr[i].style.backgroundColor = arrColor[i];
    // 属性绑定索引值
    olLiArr[i].index = i;
    // 循环绑定，为每一个li绑定点击事件
    olLiArr[i].onclick =function(){
      // 获取目标位置
      target = ulLiArr[this.index].offsetTop;
      clearInterval(timer);
      // 利用缓动动画原理实现屏幕滑动
      timer = setInterval(function(){
        // (1).获取步长
        var step = (target-leader)/10;
        // (2).二次处理步长
        step = step > 0 ? Math.ceil(step) : Math.floor(step);
        // (3).屏幕滑动
        leader = leader + step;
        window.scrollTo(0, leader);
        // (4).清除定时器
        if(Math.abs(target-leader) <= Math.abs(step)){
          window.scrollTo(0, target);
          clearInterval(timer);
        }
      }, 25);
    }
    // 用scroll事件模拟盒子距离最顶端的距离
    window.onscroll = function(){
      // 每次屏幕滑动，把屏幕卷去的值赋给leader，模拟获取显示区域距离顶部的距离
      leader = scroll().top;
    }
  }
</script>
</body>
</html>

myScroll.js

function scroll() { 
  // 开始封装自己的scrollTop
  if(window.pageYOffset !== undefined) { 
    // ie9+ 高版本浏览器
    // 因为 window.pageYOffset 默认的是0,所以需要判断
    return {
      left: window.pageXOffset,
      top: window.pageYOffset
    }
  }
  else if(document.compatMode === "CSS1Compat") {
    // 标准浏览器,来判断有没有声明DTD
    return {
      left: document.documentElement.scrollLeft,
      top: document.documentElement.scrollTop
    }
  }
  return {
    // 未声明 DTD
    left: document.body.scrollLeft,
    top: document.body.scrollTop
  }
}

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