var u = navigator.userAgent,
app = navigator.appVersion;
var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1 || u.indexOf('Windows') > -1; //android终端或者uc浏览器或者Windows
var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
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