<html> 
<head> 
<title>進(jìn)度條</title> 
<style type="text/css">  
.container{  
   width:450px;  
   border:1px solid #6C9C2C;  
   height:25px;  
 } 
#bar{  
   background:#95CA0D;  
   float:left; 
   height:100%;  
   text-align:center;  
   line-height:150%; 
 }  
</style>  
<script type="text/javascript">  
  function run(){  
        var bar = document.getElementById("bar"); 
        var total = document.getElementById("total"); 
    bar.style.width=parseInt(bar.style.width) + 1 + "%";  
    total.innerHTML = bar.style.width; 
    if(bar.style.width == "100%"){  
      window.clearTimeout(timeout); 
      return; 
    } 
    var timeout=window.setTimeout("run()",100); 
  } 
    window.onload = function(){  
       run(); 
    }  
</script> 
 
</head> 
<body> 
  <div class="container"> 
   <div id="bar" style="width:0%;"></div>  
  </div>  
  <span id="total"></span> 
</body> 
</html>

效果圖：

2.setInterval和clearInterval

<html>  
<head>  
<title>進(jìn)度條</title>  
<style type="text/css">  
.processcontainer{  
   width:450px;  
   border:1px solid #6C9C2C;  
   height:25px;  
 }  
#processbar{  
   background:#95CA0D;  
   float:left; 
   height:100%;  
   text-align:center;  
   line-height:150%; 
 }  
</style>  
<script type="text/javascript">  
 function setProcess(){  
  var processbar = document.getElementById("processbar");  
  processbar.style.width = parseInt(processbar.style.width) + 1 + "%";
  processbar.innerHTML = processbar.style.width;  
  if(processbar.style.width == "100%"){  
     window.clearInterval(bartimer);  
  }  
 }  
var bartimer = window.setInterval(function(){setProcess();},100);  
window.onload = function(){  
   bartimer;  
}  
</script>  
</head>  
<body>  
  <div class="processcontainer">  
   <div id="processbar" style="width:0%;"></div>  
  </div>  
</body>  
</html>

效果圖：

3.setTimeout和setInterval區(qū)別

setTimeout() 只執(zhí)行 code 一次。如果要多次調(diào)用，請(qǐng)使用 setInterval() ，setInterval() 方法會(huì)不停地調(diào)用函數(shù)，直到 clearInterval() 被調(diào)用或窗口被關(guān)閉，或者讓 code 自身再次調(diào)用 setTimeout()。

希望本文所述對(duì)大家的javascript程序設(shè)計(jì)有所幫助。

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