TypeError：无法读取未定义的属性（读取'forEach）

Question

无法弄清楚为什么会出现此错误

Answer 1

Your problem is that you are trying to loop though the data object which is not a array. You can only use the forEach() function on arrays. In addition, the data object is undefined meaning that it does not exist.

Since I can not see all of your code, please check out this question Cannot read property 'forEach' of undefined on how to fix the undefined data object. If that still doesn't fix the problem, read up on the documentation for supertest .