JS实现的进度条

// 进度条
//<input type="button" value="start" onclick="processBar.changeMode();if(processBar.isMoving){this.value='Stop';}else{this.value='Start';}">
//---------------------------
//<script language="javascript" src="ProcessBar.js"></script>
//<input type="button" value="start" onclick="(new ProcessBar()).changeMode();">
//可实现方法:doProcessBarAction()
//---------------------------