判断访问设备类型(android、ios、微信、pc)
var u = navigator.userAgent, app = navigator.appVersion; var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); var isWechat = u.match(/MicroMessenger/i) == 'micromessenger';