var isWx = function () {
return navigator.userAgent.toLowerCase().indexOf('micromessenger') !== -1;
};
var isIos = function () {
return /(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent);
var isAndroid = function () {
var u = navigator.userAgent;
return u.indexOf('Android') > -1 || u.indexOf('Linux') > -1;
var isSafari = function () {
return (
/Safari/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent)
);