时间：2021-07-01 10:21:17 帮助过：61人阅读
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.loading{
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
z-index: 100;
background: #fff;
}
.loading .pic{
width: 64px;
height: 64px;
background: url(loading.gif);
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
}
</style>
</head>
<body>
<img src="http://img5.imgtn.bdimg.com/it/u=4244789527,2286705620&fm=200&gp=0.jpg">
<img src="http://img5.imgtn.bdimg.com/it/u=4224538646,2973769633&fm=200&gp=0.jpg">
<img src="http://img2.imgtn.bdimg.com/it/u=3965705221,2010595691&fm=27&gp=0.jpg">
<img src="http://img4.imgtn.bdimg.com/it/u=1742626185,2547278809&fm=27&gp=0.jpg">
<img src="http://img0.imgtn.bdimg.com/it/u=3597382613,1842885761&fm=27&gp=0.jpg">
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script type="text/javascript">
$(function(){
var loading='<p class="loading"><p class="pic"></p></p>';
$('body').append(loading);
setInterval(function(){
$('.loading').fadeOut();
},3000)
})
</script>
</body>
</html>知识点：
p居中：
position: absolute; top: 0; left: 0; bottom: 0; right: 0; margin: auto;
2.
思路：利用状态事件监听的方法：onreadystatechange，判断redayState，实现加载完后显示页面的效果
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.loading{
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
z-index: 100;
background: #fff;
}
.loading .pic{
width: 64px;
height: 64px;
background: url(loading.gif);
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
}
</style>
</head>
<body>
<p class="loading">
<p class="pic"></p>
</p>
<img src="http://img5.imgtn.bdimg.com/it/u=4244789527,2286705620&fm=200&gp=0.jpg">
<img src="http://img5.imgtn.bdimg.com/it/u=4224538646,2973769633&fm=200&gp=0.jpg">
<img src="http://img2.imgtn.bdimg.com/it/u=3965705221,2010595691&fm=27&gp=0.jpg">
<img src="http://img4.imgtn.bdimg.com/it/u=1742626185,2547278809&fm=27&gp=0.jpg">
<img src="http://img0.imgtn.bdimg.com/it/u=3597382613,1842885761&fm=27&gp=0.jpg">
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script type="text/javascript">
document.onreadystatechange=function(){
if(document.redayState=='complete'){
$('loading').fadeOut();
}
}
</script>
</body>
</html>知识点：
通过onreadystatechange事件监听readyState的状态，我们只需要关心最后一个状态'complete'，当达到complete状态，说明加载成功。
3.
思路：利用CSS3实现动画效果，达到加载 完后显示页面。同样采用onreadystatechange事件监听的方法，不同的是实现了一种动态效果。
利用i标签，加入CSS样式，实现5个间隔开的矩形。利用animation每隔1.2s循环一次，无限循环。每个i标签，延时0.1s在Y方向上伸长缩短，达到动画效果。
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.loading{
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
z-index: 100;
background: #fff;
}
.loading .pic{
width: 50px;
height: 50px;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
}
.loading .pic i{
display: block;
float: left;
width: 6px;
height: 50px;
background: #399;
margin: 0 2px;
-webkit-transform: scaleY(0.4);
-ms-transform: scaleY(0.4);
transform: scaleY(0.4);
-webkit-animation: load 1.2s infinite;
animation: load 1.2s infinite;
}
.loading .pic i:nth-child(2){
-webkit-animation-delay: 0.1s;
animation-delay: 0.1s;
}
.loading .pic i:nth-child(3){
-webkit-animation-delay: 0.2s;
animation-delay: 0.2s;
}
.loading .pic i:nth-child(4){
-webkit-animation-delay: 0.3s;
animation-delay: 0.3s;
}
.loading .pic i:nth-child(5){
-webkit-animation-delay: 0.4s;
animation-delay: 0.4s;
}
@-webkit-keyframes load{
0%,40%,100%{
-webkit-transform: scaleY(0.4);
transform: scaleY(0.4);
}
20%{
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@keyframes load{
0%,40%,100%{
-webkit-transform: scaleY(0.4);
transform: scaleY(0.4);
}
20%{
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
</style>
</head>
<body>
<p class="loading">
<p class="pic">
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
</p>
</p>
<img src="http://img5.imgtn.bdimg.com/it/u=4244789527,2286705620&fm=200&gp=0.jpg">
<img src="http://img5.imgtn.bdimg.com/it/u=4224538646,2973769633&fm=200&gp=0.jpg">
<img src="http://img2.imgtn.bdimg.com/it/u=3965705221,2010595691&fm=27&gp=0.jpg">
<img src="http://img4.imgtn.bdimg.com/it/u=1742626185,2547278809&fm=27&gp=0.jpg">
<img src="http://img0.imgtn.bdimg.com/it/u=3597382613,1842885761&fm=27&gp=0.jpg">
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script type="text/javascript">
document.onreadystatechange=function(){
if(document.redayState=='complete'){
$('loading').fadeOut();
}
}
</script>
</body>
</html>知识点：
1.scale:伸长缩短。scaleX:x方向。scaleY:y方向。
2.infinite:无限循环
3.animate-delay:0.1s 延时0.1s
4.@keyframes 动画名称{
0%{
}
100%{
}
}
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