An article explaining the differences between vue attributes in detail

Vue is a popular JavaScript framework for building user interfaces with reusable components. In Vue, there are several different property types, each with its own special role. This article will introduce the differences between Vue properties.

1. Calculated properties

A calculated property refers to an attribute whose value is dynamically calculated. Computed properties can be calculated based on the values ​​of other properties and return a result. Computed properties need to be processed in Vue because their calculations are dynamic. Whenever the dependent properties change, the calculated properties also need to be recalculated.

Computed properties are defined as follows:

computed: {
  fullName: function () {
    return this.firstName + ' ' + this.lastName
  }
}

The advantage of calculated properties is that they can be used in templates and used like ordinary properties. This reduces complexity in templates through computed properties.

2. Listener

The listener is another attribute type in Vue. Its function is to monitor changes in an attribute. Once the property changes, the listener will be executed. The listener needs to be registered for the property. Every time the property changes, Vue will automatically execute the listener function.

The listener is defined as follows:

watch: {
  firstName: function (val) {
    this.fullName = val + ' ' + this.lastName
  },
  lastName: function (val) {
    this.fullName = this.firstName + ' ' + val
  }
}

The advantage of the listener is that it can listen to some specific changes or perform some specific operations, making the application more flexible and easier maintain.

3. Synchronization attribute

The synchronization attribute is an attribute whose value can be synchronized with other attributes. Synchronous properties must be handled in Vue because their values ​​are not calculated dynamically, but are directly the same as other properties. Synchronous attributes can be used to display the value of a certain attribute, thereby reducing duplicate code in templates.

The synchronization attribute is defined as follows:

data: {
  firstName: 'John',
  lastName: 'Doe'
},
computed: {
  fullName: {
    get: function () {
      return this.firstName + ' ' + this.lastName
    },
    set: function (value) {
      var names = value.split(' ')
      this.firstName = names[0]
      this.lastName = names[names.length - 1]
    }
  }
}

The advantage of the synchronization attribute is that it can be displayed in the template through simple data binding, making the template more concise.

Summary

The above is the difference between three different property types in Vue: calculated properties, listeners and synchronized properties. Computed properties are mainly used to dynamically calculate property values, listeners are used to monitor property changes and perform specific operations, and synchronized properties are used to display the value of a certain property. Depending on different needs, different attribute types can be selected, resulting in a more flexible and easy-to-maintain application.

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