前端网页加载进度条的实现
下面有三种方式，看自己需求：
一、顶部进度条
在html代码中间插入jq代码 执行动画。页面加载到哪部分，进度条就会相应的向前走多少
当全部加载完成后将loading进度条模块隐藏
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 6 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 7 <script src="jquery.min.js"></script> 8 <title>顶部进度条</title> 9 <style> 10 .loading {position: fixed;top: 0;left: 0; width: 100%; height: 100%; background-color: #fff;} 11 .pic {width: 0;height: 10px;background-color: #c33;border-radius: 5px;} 12 </style> 13 </head> 14 <body> 15 <div class="loading"> 16 <div class="pic"></div> 17 </div> 18 <header> 19 <img src="http://file02.16sucai.com/d/file/2015/0128/8b0f093a8edea9f7e7458406f19098af.jpg" alt=""> 20 <img src="http://img12.3lian.com/gaoqing02/02/93/37.jpg" alt=""> 21 </header> 22 <script> 23 $(".loading .pic").animate({width: "20%"},100); 24 </script> 25 <section> 26 <img src="http://g.hiphotos.baidu.com/zhidao/pic/item/c83d70cf3bc79f3d6e7bf85db8a1cd11738b29c0.jpg" alt=""> 27 <img src="http://big5.wallcoo.com/photograph/summer_feeling/images/%5Bwallcoo.com%5D_summer_feeling_234217.jpg" alt=""> 28 </section> 29 <script> 30 $(".loading .pic").animate({width: "40%"},100); 31 </script> 32 <section> 33 <img src="http://cdn.duitang.com/uploads/item/201409/08/20140908130732_kVXzh.jpeg" alt=""> 34 <img src="http://file02.16sucai.com/d/file/2014/1006/e94e4f70870be76a018dff428306c5a3.jpg" alt=""> 35 </section> 36 <script> 37 $(".loading .pic").animate({width: "60%"},100); 38 </script> 39 <section> 40 <img src="http://b-ssl.duitang.com/uploads/item/201703/01/20170301163305_sCd8j.gif" alt=""> 41 </section> 42 <script> 43 $(".loading .pic").animate({width: "80%"},100); 44 </script> 45 <footer> 46 <img src="http://img.51ztzj.com/upload/image/20130417/201304172007_670x419.jpg" alt=""> 47 <img src="http://img0.imgtn.bdimg.com/it/u=1618007397,4183425847&fm=26&gp=0.jpg" alt=""> 48 </footer> 49 <script> 50 $(".loading .pic").animate({width: "100%"},100, function() { 51 $(".loading").fadeOut(); 52 }); 53 </script> 54 </body> 55 </html>
二、直接在页面插入关于加载的动态图，页面加载完再隐藏掉
关于图片可以在这个网站找：https://loading.io/ 可以根据自己的需求调样式
当然，如果想自己写也可以，下面是博主自己用css3写的一个小动画
代码如下
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 6 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 7 <title>css3动画进度条</title> 8 <style> 9 .loading {position: fixed;top:0;left:0;width: 100%; height: 100%;background-color: #fff;} 10 .pic {position: absolute;top: 0;bottom: 0;left: 0;right: 0;margin: auto;width: 100px;height:40px;} 11 .pic i {float:left;margin: 0 2px;width: 6px;height: 30px;background-color: indigo;transform: scaleY(0.4);animation: load 1.2s infinite;} 12 .pic i:nth-child(2){-webkit-animation-delay: 0.1s;animation-delay: 0.1s;} 13 .pic i:nth-child(3){-webkit-animation-delay: 0.2s;animation-delay: 0.2s;} 14 .pic i:nth-child(4){-webkit-animation-delay: 0.3s;animation-delay: 0.3s;} 15 .pic i:nth-child(5){-webkit-animation-delay: 0.4s;animation-delay: 0.4s;} 16 .pic i:nth-child(6){-webkit-animation-delay: 0.5s;animation-delay: 0.5s;} 17 @-webkit-keyframes load { 18 0%,40%,100%{-webkit-transform: scaleY(0.4); transform: scaleY(0.4)} 19 20%{-webkit-transform: scaleY(1); transform: scaleY(1)} 20 } 21 @keyframes load { 22 0%,40%,100%{-webkit-transform: scaleY(0.4); transform: scaleY(0.4)} 23 20%{-webkit-transform: scaleY(1); transform: scaleY(1)} 24 } 25 </style> 26 <script src="jquery.min.js"></script> 27 <script> 28 document.onreadystatechange = function() { // 页面状态发生改变时触发 29 if(document.readyState == "complete") { // 页面加载完成时隐藏 30 $(".loading").fadeOut(); 31 } 32 } 33 </script> 34 </head> 35 <body> 36 <div class="loading"> 37 <div class="pic"> 38 <i></i> 39 <i></i> 40 <i></i> 41 <i></i> 42 <i></i> 43 <i></i> 44 </div> 45 </div> 46 <img src="http://file02.16sucai.com/d/file/2015/0128/8b0f093a8edea9f7e7458406f19098af.jpg" alt=""> 47 <img src="http://img12.3lian.com/gaoqing02/02/93/37.jpg" alt=""> 48 <img src="http://g.hiphotos.baidu.com/zhidao/pic/item/c83d70cf3bc79f3d6e7bf85db8a1cd11738b29c0.jpg" alt=""> 49 <img src="http://big5.wallcoo.com/photograph/summer_feeling/images/%5Bwallcoo.com%5D_summer_feeling_234217.jpg" alt=""> 50 <img src="http://cdn.duitang.com/uploads/item/201409/08/20140908130732_kVXzh.jpeg" alt=""> 51 <img src="http://file02.16sucai.com/d/file/2014/1006/e94e4f70870be76a018dff428306c5a3.jpg" alt=""> 52 <img src="http://b-ssl.duitang.com/uploads/item/201703/01/20170301163305_sCd8j.gif" alt=""> 53 <img src="http://img.51ztzj.com/upload/image/20130417/201304172007_670x419.jpg" alt=""> 54 <img src="http://img0.imgtn.bdimg.com/it/u=1618007397,4183425847&fm=26&gp=0.jpg" alt=""> 55 </body> 56 </html>
三、实时获取数据的进度条（百分比）
代码如下
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 6 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 7 <title>百分比进度条</title> 8 <style> 9 .loading {position: fixed;top:0;left:0;width: 100%; height: 100%;background-color: #fff;} 10 .pic {position: absolute;top: 0;bottom: 0;left: 0;right: 0;margin: auto;width: 100px;height:100px;line-height: 55px;text-align: center;font-size: 22px;} 11 .pic span {display: inline-block;position: absolute;top: 10px;left: 10px;width: 80px;height: 80px;border-radius: 50%;box-shadow: 0 3px 0 #999; 12 -webkit-animation: move 1s infinite linear;animation: move 1s infinite linear;} 13 @-webkit-keyframes move { 14 0%{-webkit-transform: rotate(0deg);transform: rotate(0deg);} 15 100%{-webkit-transform: rotate(360deg);transform: rotate(360deg);} 16 } 17 @keyframes move { 18 0%{-webkit-transform: rotate(0deg);transform: rotate(0deg);} 19 100%{-webkit-transform: rotate(360deg);transform: rotate(360deg);} 20 } 21 </style> 22 <script src="jquery.min.js"></script> 23 <script> 24 $(function() { 25 var img = $("img"); // 获取所有的img元素 26 var num = 0; // 用来存储已加载的图片个数 27 img.each(function(i) { // 遍历所有图片 28 var oImg = new Image(); 29 oImg.onload = function() { // onload 图片加载完成后执行 30 num++; 31 $(".pic p").html(parseInt(num / img.length * 100) + '%'); 32 if(num >= img.length) { 33 $(".loading").fadeOut(); // 页面加载完成后隐藏 34 } 35 } 36 oImg.src = img[i].src; 37 }) 38 }) 39 </script> 40 </head> 41 <body> 42 <div class="loading"> 43 <div class="pic"> 44 <span></span> 45 <p>0%</p> 46 </div> 47 </div> 48 <img src="http://file02.16sucai.com/d/file/2015/0128/8b0f093a8edea9f7e7458406f19098af.jpg" alt=""> 49 <img src="http://img12.3lian.com/gaoqing02/02/93/37.jpg" alt=""> 50 <img src="http://g.hiphotos.baidu.com/zhidao/pic/item/c83d70cf3bc79f3d6e7bf85db8a1cd11738b29c0.jpg" alt=""> 51 <img src="http://big5.wallcoo.com/photograph/summer_feeling/images/%5Bwallcoo.com%5D_summer_feeling_234217.jpg" alt=""> 52 <img src="http://cdn.duitang.com/uploads/item/201409/08/20140908130732_kVXzh.jpeg" alt=""> 53 <img src="http://file02.16sucai.com/d/file/2014/1006/e94e4f70870be76a018dff428306c5a3.jpg" alt=""> 54 <img src="http://b-ssl.duitang.com/uploads/item/201703/01/20170301163305_sCd8j.gif" alt=""> 55 <img src="http://img.51ztzj.com/upload/image/20130417/201304172007_670x419.jpg" alt=""> 56 <img src="http://img0.imgtn.bdimg.com/it/u=1618007397,4183425847&fm=26&gp=0.jpg" alt=""> 57 </body> 58 </html>
