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>
