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javaScript实现滚动条事件详解

本文实例为大家分享了js实现滚动条事件的具体代码，供大家参考，具体内容如下

代码：

<html>

 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
 <title></title>

 <style>
  body {
  margin: 0;
  padding: 0;
  }

  .cont {
  height: 7000px;
  }

  #top {
  position: fixed;
  width: 100%;
  height: 55px;
  top: 0px;
  left: 0px;
  background-color: rosybrown;
  display: none;
  }

  #left {
  position: fixed;
  width: 50px;
  height: 400px;
  top: 150px;
  left: 50px;
  background-color: cadetblue;
  display: none;
  }

  #left ul {
  list-style: none;
  padding-left: 0px;
  }

  #left ul li {
  border: 1px solid white;
  /*color: azure;*/
  height: 30px;
  line-height: 30px;
  text-align: center;
  margin: 15px auto;
  /*display: none;*/
  }

  .a {
  background-color: burlywood;
  color: #FFFFFF;
  }
 </style>

 <script>
  //滚动事件
  function myScroll() {

  var i = document.body.scrollTop;
  var top = document.getElementById("top");
  var left = document.getElementById("left");
  var f1 = document.getElementById("f1");
  var f2 = document.getElementById("f2");
  var f3 = document.getElementById("f3");
  var f4 = document.getElementById("f4");
  var f5 = document.getElementById("f5");
  var f6 = document.getElementById("f6");

  //控制顶部
  if(i >= 1000) {
   top.style.display = "block";
   top.innerHTML = i;
  } else {
   top.style.display = "none";
  }

  //控制左侧
  if(i >= 2000) {
   left.style.display = "block";
  } else {
   left.style.display = "none";
  }

  //显示楼层

  if(i >= 2000 && i <= 2500) {
   f1.className = "a";
   f2.className = "";
   f3.className = "";
   f4.className = "";
   f5.className = "";
   f6.className = "";
  } else if(i > 2500 && i <= 3000) {
   f1.className = "";
   f2.className = "a";
   f3.className = "";
   f4.className = "";
   f5.className = "";
   f6.className = "";
  } else if(i > 3000 && i <= 3500) {
   f1.className = "";
   f2.className = "";
   f3.className = "a";
   f4.className = "";
   f5.className = "";
   f6.className = "";
  } else if(i > 3500 && i <= 4000) {
   f1.className = "";
   f2.className = "";
   f3.className = "";
   f4.className = "a";
   f5.className = "";
   f6.className = "";
  } else if(i > 4000 && i <= 4500) {
   f1.className = "";
   f2.className = "";
   f3.className = "";
   f4.className = "";
   f5.className = "a";
   f6.className = "";
  } else if(i > 4500 && i <= 5000) {
   f1.className = "";
   f2.className = "";
   f3.className = "";
   f4.className = "";
   f5.className = "";
   f6.className = "a";
  }

  }
 </script>

 </head>

 <body onscroll="myScroll()">
 <div id="left">
  <ul>
  <li id="f1">1F</li>
  <li id="f2">2F</li>
  <li id="f3">3F</li>
  <li id="f4">4F</li>
  <li id="f5">5F</li>
  <li id="f6">6F</li>

  </ul>

 </div>
 <div id="top"></div>
 <div class="cont"></div>

 </body>

</html>

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