js判断浏览器是移动端还是web端

function mobileOs() {
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终端
if (isAndroid || isIOS) {
return 'mobile';
} else {
return 'pc';
}
}