<style>
* {
margin: 0;
padding: 0
}
ul {
list-style: none
}
body {
background-color: #333;
}
.nav {
width: 800px;
height: 42px;
margin: 100px auto;
background: url(images/rss.png) right center no-repeat;
background-color: #fff;
border-radius: 10px;
position: relative;
}
.nav li {
width: 83px;
height: 42px;
text-align: center;
line-height: 42px;
float: left;
cursor: pointer;
}
.nav span {
position: absolute;
top: 0;
left: 0;
width: 83px;
height: 42px;
background: url(images/cloud.gif) no-repeat;
}
ul {
position: relative;
}
</style>
</head>
<body>
<div class="nav">
<span id="cloud"></span>
<ul id="navBar">
<li>北京校区</li>
<li>上海校区</li>
<li>广州校区</li>
<li>深圳校区</li>
<li>武汉校区</li>
<li>关于我们</li>
<li>联系我们</li>
<li>招贤纳士</li>
</ul>
</div>
//匀速动画
function animate(element, target) {
//清理定时器
clearInterval(element.timeId);
element.timeId = setInterval(function () {
//获取元素的当前位置
var current = element.offsetLeft;
//移动的步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
current += step;
element.style.left = current + "px";
if (current == target) {
//清理定时器
clearInterval(element.timeId);
}
//测试代码:
console.log("目标位置:" + target + ",当前位置:" + current + ",每次移动步数:" + step);
}, 20);
}
//获取云彩
var cloud = my$("cloud");
//获取所有的li标签
var list = my$("navBar").children;
//循环遍历分别注册鼠标进入,鼠标离开,点击事件
for (var i = 0; i < list.length; i++) {
//鼠标进入事件
list[i].onmouseover = mouseoverHandle;
//点击事件
list[i].onclick = clickHandle;
//鼠标离开事件
list[i].onmouseout = mouseoutHandle;
}
function mouseoverHandle() {//进入
//移动到鼠标此次进入的li的位置
animate(cloud, this.offsetLeft);
}
//点击的时候,记录此次点击的位置
var lastPosition = 0;
function clickHandle() {//点击
lastPosition = this.offsetLeft;
}
function mouseoutHandle() {//离开
animate(cloud, lastPosition);
}
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