JavaScript入门学习(2)--进度条

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<html>
<style type="text/css">
#bar{width:0px; height:20px;
background:#ee00ff;}//定义进度条的前景色
</style>
<script>
var act;
function over(){
var w=document.getElementById("bar").style.pixelWidth;
if (w<400){
document.getElementById("bar").style.pixelWidth=w+2;
document.getElementById("txt").innerText="Loading..."+Math.floor((w/400)*100)+"%";
clearTimeout(act);
act=setTimeout(over,10);
} else{document.getElementById("txt").innerText="载入完成100%";
}; };
function out(){
var w=document.getElementById("bar").style.pixelWidth;
if (w>0){
document.getElementById("bar").style.pixelWidth=w-2;
document.getElementById("txt").innerText="Loading..."+Math.floor((w/400)*100)+"%";
clearTimeout(act);
act=setTimeout(out,10);
} else{document.getElementById("txt").innerText="载入完成0%";
}; };
function Apouse(){
clearTimeout(act);
};
</script>
<button onclick="over()">开始转入</button><br>
<button onclick="out()">开始卸载</button><br><br>
<button onclick="Apouse()">暂停</button><br><br><h4 id="txt">等待载入</h4>
<div id="bar"></div></html>