code: function mergeEnv(opts, env) {
      //用环境变量替换当前配置
      for (var i in env) {
          //console.log("", i);
          if (i.startsWith('pomjs_')) {
  
              var config = i.substring(6);
              if (config.indexOf('_') == -1) {
                  opts[config] = env[i];
              } else {
                  var temp = 'opts';
                  var vs = config.split('_');
                  for (var index = 0; index < vs.length; index++) {
                      temp += '.' + vs[index];
                      //console.log(temp, eval(temp));
                      if (!eval(temp) || index === vs.length - 1) {
                          var tempValue = index < vs.length - 1 ? '{}' : "'" + env[i] + "'";
                          eval(temp + '=' + tempValue);
                      }
                  }
              }
          }
      }
  
      console.log(opts.saluki);
  }
docs: 合并环境变量和配置变量，以环境变量为准
  @param opts