js區分安卓手機和蘋果手機

var u = navigator.userAgent, app = navigator.appVersion;
var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //g
var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios終端
if (isAndroid) {
    alert("安卓機！")
}
if (isIOS) {
    alert("蘋果機！")
}