(1) Computed: Cacheable. Computed values are cached after getter execution. As long as the dependent values in data are not changed,computed properties immediately return the computed results without the need to perform the function again. The next time a computed value is obtained, the corresponding getter is invoked for calculation only after the attribute values it depends on have changed. (2) Methods: Whenever rerendering occurs, the method call will always re-execute the function. (3) Watch: is a listener. It listens for a specific value and executes a specific function when the value changes. It has no caching and will execute even if the value does not change when the page is re-rendered
In summary, there is a large amount of data, so use computed data when caching is needed. Use methods every time you do need to reload and no caching is needed; Use watch when you want to listen for a value change.