如何在进度条加载后显示页面
1.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p,覆盖住图片,在内层p中引入加载时显示的图片,让内层p居中在页面上,利用setInterval定时器设置3秒后将外层p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='<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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