wx.miniProgram.getEnv(function(res) {      alert(res.miniprogram); if(res.miniprogram){         //小程序         wx.miniProgram.postMessage({data: getUrlParam("access_token")}); wx.miniProgram.navigateBack({            delta: 1         }); }else {         alert('网页'); var mUrl = getUrlParam('url').replace('mall', 'm'); top.location.href = decodeURIComponent(mUrl); }   }); 安卓手机res.miniprogram 为undefined