文章目录
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
ul {
list-style: none;
}
* {
margin: 0;
padding: 0;
}
div {
width: 1150px;
height: 400px;
margin: 50px auto;
border: 1px solid red;
overflow: hidden;
}
div li {
width: 240px;
height: 400px;
float: left;
}
div ul {
width: 1300px;
}
</style>
</head>
<body>
<div id="box">
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script src="common.js"></script>
<script>
//获取任意一个元素的任意一个属性的当前的值---当前属性的位置值
function getStyle(element, attr) {
return window.getComputedStyle ? window.getComputedStyle(element, null)[attr] : element.currentStyle[attr] || 0;
}
function animate(element, json, fn) {
clearInterval(element.timeId);//清理定时器
//定时器,返回的是定时器的id
element.timeId = setInterval(function () {
var flag = true;//默认,假设,全部到达目标
//遍历json对象中的每个属性还有属性对应的目标值
for (var attr in json) {
//判断这个属性attr中是不是opacity
if (attr == "opacity") {
//获取元素的当前的透明度,当前的透明度放大100倍
var current = getStyle(element, attr) * 100;
//目标的透明度放大100倍
var target = json[attr] * 100;
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
current += step;//移动后的值
element.style[attr] = current / 100;
} else if (attr == "zIndex") { //判断这个属性attr中是不是zIndex
//层级改变就是直接改变这个属性的值
element.style[attr] = json[attr];
} else {
//普通的属性
//获取元素这个属性的当前的值
var current = parseInt(getStyle(element, attr));
//当前的属性对应的目标值
var target = json[attr];
//移动的步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
current += step;//移动后的值
element.style[attr] = current + "px";
}
//是否到达目标
if (current != target) {
flag = false;
}
}
if (flag) {
//清理定时器
clearInterval(element.timeId);
//所有的属性到达目标才能使用这个函数,前提是用户传入了这个函数
if (fn) {
fn();
}
}
//测试代码
console.log("目标:" + target + ",当前:" + current + ",每次的移动步数:" + step);
}, 20);
}
//先获取所有的li标签
var list = my$("box").getElementsByTagName("li");
for (var i = 0; i < list.length; i++) {
list[i].style.backgroundImage = "url(images/" + (i + 1) + ".jpg)";
//鼠标进入
list[i].onmouseover = mouseoverHandle;
//鼠标离开
list[i].onmouseout = mouseoutHandle;
}
//进入
function mouseoverHandle() {
for (var j = 0; j < list.length; j++) {
animate(list[j], {"width": 100});//动画效果
}
animate(this, {"width": 800});
}
//离开
function mouseoutHandle() {
for (var j = 0; j < list.length; j++) {
animate(list[j], {"width": 240});//动画效果
}
}
</script>
</body>
</html>
固定导航栏
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0
}
img {
vertical-align: top;
}
.main {
margin: 0 auto;
width: 1000px;
margin-top: 10px;
}
.fixed {
position: fixed;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div class="top" id="topPart">
<img src="images/top.png" alt=""/>
</div>
<div class="nav" id="navBar">
<img src="images/nav.png" alt=""/>
</div>
<div class="main" id="mainPart">
<img src="images/main.png" alt=""/>
</div>
<script src="common.js"></script>
<script>
//获取页面向上或者向左卷曲出去的距离的值
function getScroll() {
return {
left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft||0,
top: window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0
};
}
//滚动事件
window.onscroll=function () {
//向上卷曲出去的距离和最上面的div的高度对比
if(getScroll().top>=my$("topPart").offsetHeight){
//设置第二个div的类样式
my$("navBar").className="nav fixed";
//设置第三个div的marginTop的值
my$("mainPart").style.marginTop=my$("navBar").offsetHeight+"px";
}else{
my$("navBar").className="nav";
my$("mainPart").style.marginTop="10px";
}
};
</script>
</body>
</html>
筋斗云
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0
}
ul {
list-style: none
}
body {
background-color: #333;
}
.nav {
width: 800px;
height: 42px;
margin: 100px auto;
background: url(images/rss.png) right center no-repeat;
background-color: #fff;
border-radius: 10px;
position: relative;
}
.nav li {
width: 83px;
height: 42px;
text-align: center;
line-height: 42px;
float: left;
cursor: pointer;
}
.nav span {
position: absolute;
top: 0;
left: 0;
width: 83px;
height: 42px;
background: url(images/cloud.gif) no-repeat;
}
ul {
position: relative;
}
</style>
</head>
<body>
<div class="nav">
<span id="cloud"></span>
<ul id="navBar">
<li>C++</li>
<li>C语言</li>
<li>Shell</li>
<li>JavaScript</li>
<li>SQL</li>
<li>Java</li>
<li>C#</li>
<li>Python</li>
</ul>
</div>
<script src="common.js"></script>
<script>
//匀速动画
function animate(element, target) {
//清理定时器
clearInterval(element.timeId);
element.timeId = setInterval(function () {
//获取元素的当前位置
var current = element.offsetLeft;
//移动的步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
current += step;
element.style.left = current + "px";
if (current == target) {
//清理定时器
clearInterval(element.timeId);
}
//测试代码:
console.log("目标位置:" + target + ",当前位置:" + current + ",每次移动步数:" + step);
}, 20);
}
//获取云彩
var cloud = my$("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);
}
</script>
</body>
</html>
