javascript - 检查对象可能是 'null' 或 'undefined'

Question

我有这段代码，我检查 hostel.country.address 是否为空，但仍然如此

return hostel.country.address &&
               hostel.country.address.internalEmployeeIdentifier !== null ||
               hostel.country.address.externalEmployeeIdentifier !== null;

我遇到这个编译问题

hostel.country.address



Object is possibly 'null' or 'undefined'.


- error TS2533: Object is possibly 'null' or 'undefined'.

Answer 1

return hostel.country.address &&
               hostel.country.address!.internalEmployeeIdentifier !== null ||
               hostel.country.address!.externalEmployeeIdentifier !== null;

应该可以。

祝你好运