本文實例講述了js實現進度條的方法。分享給大家供大家參考。具體實現方法如下：
1.setTimeout和clearTimeout
<html> <head> <title>進度條</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> <div id="bar"></div> </div> <span id="total"></span> </body> </html>效果圖：
2.setInterval和clearInterval
<html> <head> <title>進度條</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> <div id="processbar"></div> </div> </body> </html>效果圖：
3.setTimeout和setInterval區別
setTimeout() 只執行code 一次。如果要多次調用，請使用setInterval() ，setInterval() 方法會不停地調用函數，直到clearInterval() 被調用或窗口被關閉，或者讓code 自身再次調用setTimeout()。
希望本文所述對大家的javascript程序設計有所幫助。