<img width="387" alt="image" src="https://user-images.githubusercontent.com/20250430/183250584-92cc1142-2844-4f34-8155-cfd99f2ea8cb.png"> 只有第一次能正确渲染，选项变动会导致子选项undefined <img width="744" alt="image" src="https://user-images.githubusercontent.com/20250430/183250655-cc47b319-1e56-487a-9987-80c857f6fab9.png"> <img width="705" alt="image" src="https://user-images.githubusercontent.com/20250430/183250660-7a33228b-8116-4829-a3d8-52612d176996.png"> 写法和demo中一致
只有第一次能正确渲染，选项变动会导致子选项undefined
写法和demo中一致