The difference between watch and computed in vue

In Vue, watch is used to observe data changes and execute callback functions, while computed is used to create calculated properties based on other responsive data.

The difference between watch and computed in Vue

Simple answer:

watch is used to observe data changes and execute callback functions, while computed is used to create calculated properties based on other responsive data.

Detailed answer:

watch

• ##Purpose:Monitor one or more Respond to changes in data and execute callback functions.

• Advantages:

  Can handle complex data changes, such as changes to arrays or objects.
  • Allows execution of asynchronous operations or other custom logic.

• Disadvantages:

  The callback is triggered whenever the monitored data changes, which may lead to a large number of errors. Re-render if necessary.

computed

##Usage:
• Create computed properties based on other responsive data.
• Advantages:
  It will only be recalculated when the dependent data changes.
  • Cache calculated values ​​to improve performance.
  • Can be used directly in templates, just like ordinary data.
• Disadvantages:
  Unable to directly monitor changes in arrays or objects, you need to use auxiliary methods (such as useRefs).

Summary:

Use watch:
• Need to perform customization when the data changes When operating logically or asynchronously.
Use computed:
• When you need to create a computed property based on other responsive data, and want to automatically update when the dependent data changes.

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