xiaohai
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判断用户是否浏览本页面.html

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>

</body>
<script type="text/javascript">
var i = 0;
var timer = "";
function time(x){
	if(x){
		clearInterval(timer);
		return;
	};
	timer = setInterval(function(){
		i++;
		document.body.innerHTML = i;
	},1000);
};
window.addEventListener("blur",function(){
	time(1);
});
window.addEventListener("focus",function(){
	time();
});
</script>
</html>