既然新增學生需要班級選擇組件，那我們停下前進的步伐。參考前面的選擇教師組件來完成此組件的開發。 **請自行完成本節**組件位置：student/klass-select，組件名稱: KlassSelectComponent ``` panjiedeMac-Pro:student panjie$ ng g c klassSelect CREATE src/app/student/klass-select/klass-select.component.sass (0 bytes) CREATE src/app/student/klass-select/klass-select.component.html (27 bytes) CREATE src/app/student/klass-select/klass-select.component.spec.ts (664 bytes) CREATE src/app/student/klass-select/klass-select.component.ts (293 bytes) UPDATE src/app/student/student.module.ts (439 bytes) ``` \*\*注意：\*\*獲取全部班級的接口地址應該為`http://localhost:8080/Klass?name=`而非`http://localhost:8080/Klass`