Modify data value in vue

Vue.js is a popular JavaScript framework that is widely used to create dynamic, interactive interfaces. At the core of Vue.js is the reactive data binding mechanism, which automatically keeps views in sync with data. In Vue.js, we can modify the data of components in a simple and intuitive way, which is called "responsive data".

In Vue.js, we can use the "data" option to define the data of the component. The "data" option is a function that returns an object containing the component's data. For example:

Vue.component('my-component', {
  data: function () {
    return {
      message: 'Hello Vue.js!'
    }
  }
})

In the above example, we defined a "my-component" component and defined a data named "message" to it. Its initial value is "Hello Vue.js".

Now, let’s take a look at how to modify the component’s data. We can use "this.$data" to access the component's data object, and then directly modify its attribute values, for example:

Vue.component('my-component', {
  data: function () {
    return {
      message: 'Hello Vue.js!'
    }
  },
  methods: {
    changeMessage: function () {
      this.$data.message = 'Welcome to Vue.js!'
    }
  }
})

In the above example, we defined a called "changeMessage" method, which is bound to the component's click event. When the component is clicked, it calls the "changeMessage" method to modify the value of the "message" property. Note that we use "this.$data.message" to get the value of the "message" property, and use an assignment statement to modify it to the new value.

In addition, in Vue.js, we can also use the "Vue.set" method to modify the value of the data. This method can be used to modify the values ​​of arrays and objects. For example:

Vue.component('my-component', {
  data: function () {
    return {
      data: {
        name: 'John',
        age: 30
      }
    }
  },
  methods: {
    changeData: function () {
      Vue.set(this.$data.data, 'age', 31)
    }
  }
})

In the above example, we defined an object named "data" and defined two attributes for it: a string attribute named "name" and a Numeric property of "age". When we click on the component, it calls the "changeData" method to modify the value of the "age" property. We used the "Vue.set" method to modify the value of the "age" attribute to 31.

Summary

In Vue.js, modifying the value of data is very simple and intuitive. We can use "this.$data" to access the data object and modify its property values ​​directly. In addition, we can also use the "Vue.set" method to modify the values ​​of arrays and objects. These methods make it very convenient for us to implement dynamic data updates of components.

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