js实现带简单弹性运动的导航条

晚上跟着视频敲了下 弹性菜单的代码，先记下来

效果如下：

代码如下：

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <style>
 *{
  margin:0;
  padding:0;
 }
 .ul1{
  width:450px;
  height:30px;
  margin:20px auto;
  position:relative;
 }
 li{
  list-style:none;
  line-height:30px;
  height:30px;
  width:100px;
  color:orange;
  text-align:center;
  float:left;
  margin-right:5px;
  border:1px soli #000;
  background-color:red;
 }
 .mark{
  position:absolute;
  left:0;
  top:0;
  overflow:hidden;
 }
 .mark ul{
  width:450px;
  position:absolute;
  left:0;
  top:0;
 }
 .mark ul li{
  color:#fff;
  background-color:deepskyblue;
 }
 </style>
</head>
<body>
<ul class="ul1">
 <li class="mark">
 <ul>
  <li>首页</li>
  <li>论坛</li>
  <li>视频</li>
  <li>课程</li>
 </ul>
 </li>
 <li class="box">首页</li>
 <li class="box">论坛</li>
 <li class="box">视频</li>
 <li class="box">课程</li>
</ul>
</body>
<script>
 window.onload = function(){
 var oMark = document.querySelector('.mark');
 var oBox = document.querySelectorAll('.box');
 var childUl = oMark.querySelector('ul');
 var timer = null;
 var timer2 = null;//延迟定时器，100毫秒人的眼睛是察觉不出来的
 var iSpeed = 0;
 for (var i=0;i<oBox.length;i++){
  oBox[i].onmouseover = function(){
  clearTimeout(timer2);
  startMove(this.offsetLeft);
  };
  oBox[i].onmouseout = function(){
  timer2 = setTimeout(function(){
   startMove(0);
  },100);

  };
 }
 oMark.onmouseover = function(){
  clearTimeout(timer2);
 };
 oMark.onmouseout= function(){
  timer2 = setTimeout(function(){
  startMove(0);
  },100);
 };
 function startMove(iTarget){
  clearInterval(timer);
  timer = setInterval(function(){
  iSpeed += (iTarget -oMark.offsetLeft)/5;
  iSpeed *= 0.75;
  if(Math.abs(iSpeed)<=1 && Math.abs(iTarget -oMark.offsetLeft)<=1){
   clearInterval(timer);
   oMark.style.left = iTarget + 'px';
   childUl.style.left = -iTarget + 'px';
   iSpeed = 0;
  }else {
   oMark.style.left = oMark.offsetLeft + iSpeed +'px';
   childUl.style.left = -oMark.offsetLeft +'px';
  }
  },30);
 };
 };
</script>
</html>

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