angualr4 自定义表单验证问题

Question

 add = this.form.group({     buildingNo: [null, [Validators.required]],     roomNo: [null, [Validators.required]],     roomResourceType: ['1', [Validators.required]],     roomBuildAcreage: [null, [Validators.required]],     roomEquipments: [null, [Validators.required]],     roomDecorateState: ['1', [Validators.required]],     roomRentedAcreage: [null, [Validators.required]],     roomResourceState: ['1', [Validators.required]],     roomDesc: [null],   });现在想验证 roomBuildAcreage必须大于等于roomRentedAcreage 的自定义验证应该怎么写啊小白求教

Answer 1

在roomBuildAcreage后面添加一个自定义的函数，在里面取出roomRentedAcreage 进行比较一下，不符合条件就返回错误，就好了