HTML, css, and javascript realize floor-hopping page layout-JS Tutorial-php.cn

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HTML, css, and javascript realize floor-hopping page layout

小云云

Jan 22, 2018 am 10:09 AM

html javascript

This article mainly introduces pure html+css+javascript to realize floor-jumping page layout. Friends who need it can refer to it. I hope it can help everyone.

Implementation effect demonstration:

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>

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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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