code: function check(pm){
          let resdata = {};
          // 检查必须参数
          must = must || [];
          for(let i in must){
              let one = must[i];
              if(pm[one]===undefined){
                  if(conf.missmust){ // 外部处理
                      conf.missmust(req, res, one);
                  }
                  return false; // 检查失败
              }
              resdata[one] = pm[one];
          }
          // 设置默认参数
          other = other || {};
          for(let i in other){
              if(pm[i]===undefined){
                  resdata[i] = other[i];
              }else{
                  resdata[i] = pm[i];
              }
          }
          return resdata;
      }
docs: 检查必传参数