HTML5+CSS3网页加载进度条的实现，下载进度条的代码实例

<div id="loadBar01" class="loadBar">  
       <div>  
            <span class="percent">  
               <i></i>  
            </span>  
       </div>  
       <span class="percentNum">0%</span>  
   </div> 

body  
       {  
           font-family: Thoma, Microsoft YaHei, 'Lato', Calibri, Arial, sans-serif;  
       }  
  
       #content  
       {  
           margin: 120px auto;  
           width: 80%;  
       }  
  
       .loadBar  
       {  
           width: 600px;  
           height: 30px;  
           border: 3px solid #212121;  
           border-radius: 20px;  
           position: relative;  
       }  
  
       .loadBar div  
       {  
           width: 100%;  
           height: 100%;  
           position: absolute;  
           top: 0;  
           left: 0;  
       }  
  
       .loadBar div span, .loadBar div i  
       {  
           box-shadow: inset 0 -2px 6px rgba(0, 0, 0, .4);  
           width: 0%;  
           display: block;  
           height: 100%;  
           position: absolute;  
           top: 0;  
           left: 0;  
           border-radius: 20px;  
       }  
  
       .loadBar div i  
       {  
           width: 100%;  
           -webkit-animation: move .8s linear infinite;  
           background: -webkit-linear-gradient(left top, #7ed047 0%, #7ed047 25%, #4ea018 25%, #4ea018 50%, #7ed047 50%, #7ed047 75%, #4ea018 75%, #4ea018 100%);  
           background-size: 40px 40px;  
       }  
  
       .loadBar .percentNum  
       {  
           position: absolute;  
           top: 100%;  
           right: 10%;  
           padding: 1px 15px;  
           border-bottom-left-radius: 16px;  
           border-bottom-right-radius: 16px;  
           border: 1px solid #222;  
           background-color: #222;  
           color: #fff;  
  
       }  
  
       @-webkit-keyframes move  
       {  
           0%  
           {  
               background-position: 0 0;  
           }  
           100%  
           {  
               background-position: 40px 0;  
           }  
       }  

function LoadingBar(id)  
       {  
           this.loadbar = $("#" + id);  
           this.percentEle = $(".percent", this.loadbar);  
           this.percentNumEle = $(".percentNum", this.loadbar);  
           this.max = 100;  
           this.currentProgress = 0;  
       }  
       LoadingBar.prototype = {  
           constructor: LoadingBar,  
           setMax: function (maxVal)  
           {  
               this.max = maxVal;  
           },  
           setProgress: function (val)  
           {  
               if (val >= this.max)  
               {  
                   val = this.max;  
               }  
               this.currentProgress = parseInt((val / this.max) * 100) + "%";  
               this.percentEle.width(this.currentProgress);  
               this.percentNumEle.text(this.currentProgress);  
  
  
           }  
       };