原生JavaScript实现进度条

JavaScript实现进度条的具体代码，供大家参考，具体内容如下

进度条实现介绍

使用JavaScript实现进度条功能。

原理：通过鼠标移动事件，获取鼠标移动的距离。

步骤：

（1）html 中 div 布局
（2）css 样式编写
（3）JavaScript特效编写

html代码

<body>
 <!-- 整体盒子 -->
 <div id="box">
 <!-- 进度条整体 -->
 <div id="progress">
 <!-- 进度条长度 -->
  <div id="progress_head"></div>
 <!-- 进度条移动条 -->
 <span id="span"></span>
 <div>
 <!-- 显示数据 -->
 <div id="percentage">0%</div>
 </div>
</body>

css样式

<style>
 /* 整体样式，消除默认样式 */
 body{
 margin:0;
 padding:0;
 }
 #box{
 position:relative;
 width:1000px;
 height:30px;
 margin:100px auto;
 } 
 #progress{
 position:relative;
 width:900px;
 height:30px;
 background:#999999;
 border-radius:8px;
 margin:0 auto; 
 }
 #progress_head{
 width:0px;
 height:100%;
 border-top-left-radius:8px;
 border-bottom-left-radius:8px;
 background:#9933CC;
 
 }
 span{
 position:absolute;
 width:20px;
 height:38px;
 background:#9933CC;
 top:-4px;
 left:0px;
 cursor:pointer;
 }
 #percentage{
 position:absolute;
 line-height:30px;
 text-align:center;
 right:-44px;
 top:0;
 }
 
 
</style>

JavaScript代码

<script>

 //js获取节点
 var oProgress=document.getElementById('progress');
 var oProgress_head=document.getElementById('progress_head');
 var oSpan=document.getElementById('span');
 var oPercentage=document.getElementById('percentage')

 //添加事件 鼠标按下的事件
 oSpan.onmousedown=function(event){
 
 var event=event || window.event;
 var x=event.clientX-oSpan.offsetLeft;

 document.onmousemove=function(){
 
 var event=event || window.event;
 var wX=event.clientX-x;
 
 
 if(wX<0)
 {
  wX=0;
 }else if(wX>=oProgress.offsetWidth-20)
 {
  wX=oProgress.offsetWidth - 20;
 }
 oProgress_head.style.width=wX+'px';
 oSpan.style.left=wX+'px';
 
 oPercentage.innerHTML=parseInt(wX/(oProgress.offsetWidth-20)*100)+'%';
 
 return false;
 };
 
 document.onmouseup=function(){
 
 document.onmousemove=null; 
 };
 
 }; 
</script>

效果图

整体代码

<!DOCTYPE>
<html lang="en">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>进度条</title>
 <style>
 /* 整体样式，消除默认样式 */
 body{
 margin:0;
 padding:0;
 }
 #box{
 position:relative;
 width:1000px;
 height:30px;
 margin:100px auto;
 } 
 #progress{
 position:relative;
 width:900px;
 height:30px;
 background:#999999;
 border-radius:8px;
 margin:0 auto; 
 }
 #progress_head{
 width:0px;
 height:100%;
 border-top-left-radius:8px;
 border-bottom-left-radius:8px;
 background:#9933CC;
 
 }
 span{
 position:absolute;
 width:20px;
 height:38px;
 background:#9933CC;
 top:-4px;
 left:0px;
 cursor:pointer;
 }
 #percentage{
 position:absolute;
 line-height:30px;
 text-align:center;
 right:-44px;
 top:0;
 }
 
 
 </style>
</head>
<body>

 <!-- 整体盒子 -->
 <div id="box">
 <!-- 进度条整体 -->
 <div id="progress">
 <!-- 进度条长度 -->
  <div id="progress_head"></div>
 <!-- 进度条移动条 -->
 <span id="span"></span>
 <div>
 <!-- 显示数据 -->
 <div id="percentage">0%</div>
 </div>

</body>
</html>
<script>

 //js获取节点
 var oProgress=document.getElementById('progress');
 var oProgress_head=document.getElementById('progress_head');
 var oSpan=document.getElementById('span');
 var oPercentage=document.getElementById('percentage')

 //添加事件 鼠标按下的事件
 oSpan.onmousedown=function(event){
 
 var event=event || window.event;
 var x=event.clientX-oSpan.offsetLeft;

 document.onmousemove=function(){
 
 var event=event || window.event;
 var wX=event.clientX-x;
 
 
 if(wX<0)
 {
  wX=0;
 }else if(wX>=oProgress.offsetWidth-20)
 {
  wX=oProgress.offsetWidth - 20;
 }
 oProgress_head.style.width=wX+'px';
 oSpan.style.left=wX+'px';
 
 oPercentage.innerHTML=parseInt(wX/(oProgress.offsetWidth-20)*100)+'%';
 
 
 return false;
 };
 
 document.onmouseup=function(){
 
 document.onmousemove=null;
 
 };
 
 };
 
</script>

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