Calculate attribute
Evaluating attributes is a function in VUe3
- This function is consistent with computed configuration
- When you only have getter, you pass in a callback function
- You have getters and setters, you pass in an object, you have get and set property methods
- The return value is the calculated property we need
Watch function
- The functions are the same as those configured on the Watch
- Monitors one or more specified reactive data and automatically executes monitoring callbacks whenever the data changes
- By default, the initial callback is not executed. However, you can specify that the initial callback is executed immediately by setting immediate to true
- Set deep to true to specify that deep monitoring immediate and deep are configured in the third parameter
WatchEffect function
- Instead of specifying the data to monitor directly, which reactive data is used in the callback function monitors which reactive data
- By default, the first execution is performed initially so that data that needs to be monitored can be collected
- Callback when monitoring data changes