code: function parseOn(cls, alias, method, joinTable, joinAlias, on) {
      cls[method](`${joinTable} as ${joinAlias}`, function () {
          for (let n in on) {
              if (n.toLowerCase() === 'or') {
                  if (!helper.isArray(on[n])) {
                      continue;
                  }
                  on[n].map(item => {
                      for (let i in item) {
                          this.orOn(`${alias}.${i}`, '=', `${joinAlias}.${item[i]}`);
                      }
                  });
              } else {
                  this.on(`${alias}.${n}`, '=', `${joinAlias}.${on[n]}`);
              }
          }
      });
  }
docs: 解析JOIN ON/ORON 条件