nodejs实现发出蜂鸣声音(系统报警声)的方法

process.stdout.write('\x07')

var FANQIE_TIME = 25;
function beep()
{
for(var i =0;i<20;i++)
{
process.stdout.write('\x07')
}
}
var startTime = new Date(); 
var needTime =startTime.setMinutes(startTime.getMinutes()+FANQIE_TIME);
function showTime()
{
var now = new Date();
var totalSecond = Math.floor( (needTime - now)/1000)
if(totalSecond<=0)
{
beep();
if(interVal)
{
clearInterval(interVal);
}
return;
}
var mm =Math.floor(totalSecond/60);
var ss = Math.floor( totalSecond%60);
console.log(mm+":"+ss);
}
var interVal = setInterval(showTime,1000);