判斷是否是微信瀏覽器打開

var broser = window.navigator.userAgent.toLowerCase();
 //通過正則表達式匹配broser 中是否含有MicroMessenger字符串
 if(broser .match(/MicroMessenger/i) == 'micromessenger'){
     console.log('微信瀏覽器')
}