http://www.jb51.net/article/61113.htm（转载出处）
本文实例讲述了js实现进度条的方法。分享给大家供大家参考。具体实现方法如下：
1.setTimeout和clearTimeout
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<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>
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效果图：
2.setInterval和clearInterval
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<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()。
希望本文所述对大家的javascript程序设计有所帮助。