本文实例讲述了JS实现横向拉伸动感伸缩菜单效果代码。分享给大家供大家参考。具体如下：
这是一款JS实现的纵向拉伸变横向拉伸，动感伸缩菜单，紧身排列的CSS菜单，可用在博客等重要的位置部分作菜单，学习JavaScript前端设计的也可以作为参考范例。
运行效果截图如下：
在线演示地址如下：
http://demo.uoften.com/js/2015/js-row-show-menu-style-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>有弹性的菜单</title>
<style>
*{ margin:0px; padding:0px;} body { background:#fff;} .naver{list-style-type:
none; width:700px; overflow:hidden; margin:100px auto 0;} .naver li{ width:100px;
height:50px; overflow:hidden; font-size:16px; text-align:center; cursor:
pointer; } .naver li a,.naver li a:hover{display: block;width:100px; height:50px;
line-height: 50px; color:#FFF; text-decoration: none; } .co1{ background:#649e37}
.co2{ background:#028fbc}
</style>
<script type="text/javascript">
window.onload = function() {
var oUl = document.getElementById("nav");
var aLi = oUl.getElementsByTagName("li");
var i = 0;
for (i = 0; i < aLi.length; i++) {
aLi[i].timer = null;
aLi[i].speed = 0;
aLi[i].onmouseover = function() {
startMove(this, 250);
};
aLi[i].onmouseout = function() {
startMove2(this, 100);
};
}
};
function startMove(obj, iTarget) {
if (obj.timer) {
clearInterval(obj.timer);
}
obj.timer = setInterval(function() {
doMove(obj, iTarget);
}, 30)
};
function doMove(obj, iTarget) {
obj.speed += 3;
if (Math.abs(iTarget - obj.offsetWidth) < 1 && Math.abs(obj.speed) < 1) {
clearInterval(obj.timer);
obj.timer = null;
}
else {
if (obj.offsetWidth + obj.speed >= iTarget) {
obj.speed *= -0.7;
obj.style.width = iTarget + "px";
}
else {
obj.style.width = obj.offsetWidth + obj.speed + "px";
}
}
};
function startMove2(obj, iTarget) {
if (obj.timer) {
clearInterval(obj.timer);
}
obj.timer = setInterval(function() {
doMove2(obj, iTarget);
}, 30)
};
function doMove2(obj, iTarget) {
obj.speed -= 3;
if (Math.abs(iTarget - obj.offsetWidth) < 1 && Math.abs(obj.speed) < 1) {
clearInterval(obj.timer);
obj.timer = null;
}
else {
if (obj.offsetWidth + obj.speed <= iTarget) {
obj.speed *= -0.7;
obj.style.width = iTarget + "px";
}
else {
obj.style.width = obj.offsetWidth + obj.speed + "px";
}
}
};
</script>
</head>
<body>
<ul id="nav" class="naver">
<li class="co1">
<a href="#">首页</a>
</li>
<li class="co2">
<a href="#">爱好</a>
</li>
<li class="co1">
<a href="#">作品</a>
</li>
<li class="co2">
<a href="#">联系</a>
</li>
<li class="co1">
<a href="#">博客</a>
</li>
</ul>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
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