JS判断设备类型是否为电脑，是否为移动设备

PC判断是否为手机，代码如下
<script type=”text/javascript”>
!function () {
function params(u, p) {
var m = new RegExp(“(?:&|/?)” + p + “=([^&$]+)”).exec(u);
return m ? m[1] : ”;
}
if (/iphone|android|ipod/i.test(navigator.userAgent.toLowerCase()) == true && params(location.search, “from”) != “mobile”) {
location.href = ”;
}
}();
</script>
移动端判断是否为PC，代码如下
<script type=”text/javascript”>
! function() {
if (/iphone|android|ipod/i.test(navigator.userAgent.toLowerCase()) == false) {
location.href = ”;
}
}();
document.documentElement.style.fontSize = document.documentElement.clientHeight/document.documentElement.clientWidth<1.5 ? (document.documentElement.clientHeight/603*312.5+”%”) : (document.documentElement.clientWidth/375*312.5+”%”);
</script>