1. When operating, you need to control the availability of the button, such as the new button is available, save the button is not available; if you use bulk deletion, the delete button is not available when there is no data in the list. 2. The state of the current page needs to be saved when the page jump is required. It is inconvenient to use. 3. The visibility of the button needs to be controlled according to the permissions, avoiding unnecessary trouble for the availability control during the operation. 4. For unimportant data control or real-time control, you can save server resources to save server resources.
