原文地址：http://www.fufuok.com/js-iphone-android.html
if (/(iPhone|iPad|iPod|iOS)/i.test(window.navigator.userAgent)) {
alert('ios -- ' + window.navigator.userAgent);
//window.location.href ="iPhone.html";
}
else if (/(Android)/i.test(window.navigator.userAgent)) {
alert('android -- ' + window.navigator.userAgent);
//window.location.href ="Android.html";
}
else {
alert('pc -- ' + window.navigator.userAgent);
//window.location.href ="pc.html";
};