进度条加载后显示页面
Posted 逗比煎饼侠
tags:
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思路:加入很多图片,以延迟加载时间,实现加载完后显示图片。定义一个外层DIV,覆盖住图片,在内层DIV中引入加载时显示的图片,让内层DIV居中在页面上,利用setInterval定时器设置3秒后将外层DIV隐藏,从而显示图片,达到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>
- <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=‘<div class="loading"><div class="pic"></div></div>‘;
- $(‘body‘).append(loading);
- setInterval(function(){
- $(‘.loading‘).fadeOut();
- },3000)
- })
- </script>
- </body>
- </html>
知识点:
DIV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>
- <div class="loading">
- <div class="pic"></div>
- </div>
- <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>
- <div class="loading">
- <div class="pic">
- <i></i>
- <i></i>
- <i></i>
- <i></i>
- <i></i>
- </div>
- </div>
- <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>
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
[email protected] 动画名称{
0%{
}
100%{
}
}
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