执行两次数据库查询和计算，分别对应calculate1()和calculate2()。 下面
Promise.all写法，要不就全部返回正确结果，要不就都返回错误信息。  如何在返回
错误的时候，返回部分正确的结果？

谢谢

app.get('/api/doAll/, function(req, res) {
   Promise.all(
     [
      new Promise(function(resolve, reject) {
          // access mongodb and make some calculation
          var data1;
          if (calculate1(data1)) {
             resolve(data1);
          }
          else {
             reject("error1");
          }
      }),

      new Promise(function(resolve, reject) {
          // access mongodb and make some calculation
          var data2;
          if (calculate2(data2)) {
             resolve(data2);
          }
          else {
             reject("error2");
          }
      })
      ]
   ).then(function(data) {
      res.end(JSON.stringify(data);
   }).catch(function(error) {
      res.status = 500;
   });
});
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FROM 107.178.194.*