js判断是否移动端并跳转到手机版

<script type="text/javascript">
$(function(){
var MobileUA = (function() {
var ua = navigator.userAgent.toLowerCase();

var mua = {
IOS: /ipod|iphone|ipad/.test(ua), //iOS
IPHONE: /iphone/.test(ua), //iPhone
IPAD: /ipad/.test(ua), //iPad
ANDROID: /android/.test(ua), //Android Device
WINDOWS: /windows/.test(ua), //Windows Device
TOUCH_DEVICE: ('ontouchstart' in window) || /touch/.test(ua), //Touch Device
MOBILE: /mobile/.test(ua), //Mobile Device (iPad)
ANDROID_TABLET: false, //Android Tablet
WINDOWS_TABLET: false, //Windows Tablet
TABLET: false, //Tablet (iPad, Android, Windows)
SMART_PHONE: false //Smart Phone (iPhone, Android)
};

mua.ANDROID_TABLET = mua.ANDROID && !mua.MOBILE;
mua.WINDOWS_TABLET = mua.WINDOWS && /tablet/.test(ua);
mua.TABLET = mua.IPAD || mua.ANDROID_TABLET || mua.WINDOWS_TABLET;
mua.SMART_PHONE = mua.MOBILE && !mua.TABLET;

return mua;
}());

//SmartPhone
if (MobileUA.SMART_PHONE) {
// 移动端链接地址
var mobiledomain = "m.mobiledomain.com" ;

if(mobiledomain==''){
document.location.href = "http://www.domain.com";
}else{
document.location.href = "http://"+mobiledomain;
}


}
});
</script>