即使用户在Android或手机屏幕中离开浏览器时，也需要一个继续刷新页面的脚本

I have use:

    $page = $_SERVER['PHP_SELF'];
$sec = "3";
header("Refresh: $sec; url=$page");

and

<script>
setTimeout(function(){
window.location.reload(1);
}, 5000);
</script>

to refresh my page on an android device. However, it stops refreshing if I leave the browser or my phone screen turns off. How can I keep refreshing?