小程序环境变量配置，区分开发、体验、线上

const envVersion = __wxConfig.envVersion
//envVersion: 'develop',    //开发版
//envVersion: 'trial',          //体验版
//envVersion: 'release',     //正式版
let host;
if(envVersion == 'release'){
  host = 'https://xxxx.com'
}else{
  host = 'http://xxxx.com'
}