JS 无鼠标键盘操作时跳转页面

客户提了一个需求,无鼠标键盘操作一段时间时,跳转页面到首页,做了一下午,搞定!
<html>
<head>
<script type="text/javascript">
function ScreenSaver(settings){
	this.settings = settings;

	this.nTimeout = this.settings.timeout;
			
	document.body.screenSaver = this;
	// link in to body events
	document.body.onmousemove = ScreenSaver.prototype.onevent;
	document.body.onmousedown = ScreenSaver.prototype.onevent;
	document.body.onkeydown = ScreenSaver.prototype.onevent;
	document.body.onkeypress = ScreenSaver.prototype.onevent;
	
	var pThis = this;
	var f = function(){pThis.timeout();}
	this.timerID = window.setTimeout(f, this.nTimeout);
}
ScreenSaver.prototype.timeout = function(){
	if ( !this.saver ){
		window.location = 'http://www.baidu.com';
	}
}
ScreenSaver.prototype.signal = function(){
	if ( this.saver ){
		this.saver.stop();
	}
	
	window.clearTimeout(this.timerID);
	
	var pThis = this;
	var f = function(){pThis.timeout();}
	this.timerID = window.setTimeout(f, this.nTimeout);
}

ScreenSaver.prototype.onevent = function(e){
	this.screenSaver.signal();
}


var saver;
function initScreenSaver(){
	//blort;
	saver = new ScreenSaver({timeout:5000});
}
function window.onload(){
  initScreenSaver();
}

</script>
	</head>
	<body>
</p>5秒不动就跳转
	</body>
</html>

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