网站loading的几种实现方法


1、

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.loading{
height:100%;
100%;
position: fixed;
#fff;
z-index: 1000;
}
.loading .pic{
160px;
height:20px;
background:url(./img/loading.gif);
position: absolute;
left:0;
top:0;
right:0;
bottom:0;
margin:auto;
}
</style>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script>
$(function(){
$('body').append()
setTimeout(function(){
$('.loading').fadeOut()
},3000)
})
</script>
</head>
<body>
<div>
<div></div>
</div>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1565938420,1502042431&fm=200&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3270585678,1405391765&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2906071610,811972283&fm=27&gp=0.jpg" alt="">
<img src=https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1129568991,2883037091&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</body>
</html>

2、

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.loading{
height:100%;
100%;
position: fixed;
#fff;
z-index: 1000;
}
.loading .pic{
160px;
height:20px;
background:url(./img/loading.gif);
position: absolute;
left:0;
top:0;
right:0;
bottom:0;
margin:auto;
}
</style>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script>
document.onreadystatechange = function(){
if(document.readyState=='complete'){
$('.loading').fadeOut()
}
}
</script>
</head>
<body>
<div>
<div></div>
</div>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1565938420,1502042431&fm=200&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3270585678,1405391765&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2906071610,811972283&fm=27&gp=0.jpg" alt="">
<img src=https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1129568991,2883037091&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</body>
</html>

3、

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.loading{
height:100%;
100%;
position: fixed;
#fff;
z-index: 1000;
}
.loading .pic{
50px;
height:50px;
position: absolute;
left:0;
top:0;
right:0;
bottom:0;
margin:auto;
}
.loading .pic i{
display: block;
float: left;
6px;
height:50px;
background-color: #399;
margin:0 2px;
-webkit-transform: scale(0.4);
   -ms-transform: scale(0.4);
       transform: scale(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: scale(0.4); transform: scale(0.4); }
20%{ -webkit-transform: scale(1); transform: scale(1); }
}
@keyframes load{
0%,40%,100%{ -webkit-transform: scale(0.4); transform: scale(0.4); }
20%{ -webkit-transform: scale(1); transform: scale(1); }
}
</style>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script>
document.onreadystatechange = function(){
if(document.readyState=='complete'){
$('.loading').fadeOut()
}
}
</script>
</head>
<body>
<div>
<div>
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
</div>
</div>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1565938420,1502042431&fm=200&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3270585678,1405391765&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2906071610,811972283&fm=27&gp=0.jpg" alt="">
<img src=https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1129568991,2883037091&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</body>
</html>

4、

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.loading{
height:100%;
100%;
position: fixed;
#fff;
z-index: 1000;
}
.loading .pic{
0%;
height:5px;
position: absolute;
left:0;
top:0;
background: #f33
}

</style>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>

</head>
<body>
<div>
<div>
</div>
</div>
<header>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1565938420,1502042431&fm=200&gp=0.jpg" alt="">
</header>
<script>
$('.loading .pic').animate({"10%"},100)
</script>
<section>
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3270585678,1405391765&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</section>
<script>
$('.loading .pic').animate({"30%"},100)
</script>
<section>
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2906071610,811972283&fm=27&gp=0.jpg" alt="">
<img src=https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1129568991,2883037091&fm=27&gp=0.jpg" alt="">
</section>
<script>
$('.loading .pic').animate({"60%"},100)
</script>
<section>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</section>
<script>
$('.loading .pic').animate({"90%"},100)
</script>
<section>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
</section>
<footer>

</footer>
<script>
$('.loading .pic').animate({"100%"},100,function(){
$('.loading').fadeOut()
})
</script>


</body>
</html>

5、

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.loading{
height:100%;
100%;
position: fixed;
#fff;
z-index: 1000;
}
.loading .pic{
100px;
height:100px;
position: absolute;
left:0;
top:0;
right:0;
bottom:0;
margin:auto;
border:1px solid red;
font-size:30px;
text-align: center;
line-height:100px;

}
.loading .pic span{
display: block;
80px;
height:80px;
position: absolute;
top:10px;
left:10px;
border-radius:50%;
box-shadow: 0 3px 0 #666;
animation:rotate 1s infinite linear; 
-webkit-animation:rotate 1s infinite linear; 
}
@keyframes rotate{
0%{transform: rotate(0deg);}
100%{transform: rotate(360deg);}
}
@-webkit-keyframes rotate{
0%{-webkit-transform: rotate(0deg);}
100%{-webkit-transform: rotate(360deg);}
}
</style>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script>
$(function(){
// var img = new Image()
// img.onload = function(){

// }
// img.src='123.jpg'
var img = $('img');
var num =0;

img.each(function(i){
var oImg = new Image();

oImg.onload = function(){

oImg.onload = null

num++

$('.loading b').html(parseInt(num/$('img').length*100)+"%")

if (num>=i) {
$('.loading').fadeOut()
}
}

oImg.src=img[i].src
})
})
</script>
</head>
<body>
<div>
<div>
<span></span>
<b>0%</b>
</div>
</div>
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=471732479,562853153&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1565938420,1502042431&fm=200&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3270585678,1405391765&fm=27&gp=0.jpg" alt="">
<img src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=164104570,3489576029&fm=27&gp=0.jpg" alt="">
<img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2906071610,811972283&fm=27&gp=0.jpg" alt="">
<img src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1129568991,2883037091&fm=27&gp=0.jpg" alt="">

<img src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=502325189,2728483660&fm=27&gp=0.jpg" alt="">
<img src="https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=3887715991,2420229997&fm=27&gp=0.jpg" alt="">

</html>
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原文地址：https://www.cnblogs.com/zhangshuda/p/7640178.html