进度条（js实现）

来源：互联网发布：ds video windows 编辑：程序博客网时间：2024/06/06 12:48

1.setTimeout和clearTimeout

<html><head><title>进度条</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>

效果图：

2.setInterval和clearInterval

<html> <head> <title>进度条</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>

效果图：

3.setTimeout和setInterval区别

setTimeout() 只执行 code 一次。如果要多次调用，请使用 setInterval() ，setInterval() 方法会不停地调用函数，直到 clearInterval() 被调用或窗口被关闭，或者让 code 自身再次调用 setTimeout()。

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