判断是否是微信端的代码

isWeiXin(){       var ua = window.navigator.userAgent.toLowerCase();       if(ua.match(/MicroMessenger/i) == 'micromessenger'){          this.isweiXin=true;           console.log(true) ;           return true;        }else{           this.isweiXin=false;          console.log(false) ;           return false;         }       }