How to access the data in vue's data

Vue is a progressive framework for building user interfaces that is flexible and extensible, making it easy to build single-page applications. However, Vue can also have a certain learning curve, especially for those who are beginners, how to access Vue's data variables can be a difficult problem. In this article, we will explore how to access the data property of a Vue instance.

Vue instance is the core of Vue, which stores component data, methods, etc. Among them, data is one of the most commonly used attributes, which contains the data that needs to be bound within the application. Let's take a look at how to access the data attribute of a Vue instance.

First, we need to create a Vue instance. The following code shows how to create a Vue instance and bind data to the data property:

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  }
})

In the above code, we create a Vue instance and store it in the variable "app" middle. We also bind a variable called message to the data property of this instance.

Accessing the data attribute of the Vue instance is very simple, we only need to use the "$data" attribute of the Vue instance to access it. The following code shows how to access the data attribute of the Vue instance:

console.log(app.$data.message);

In the above code, we use the console.log() method to print the value of the variable message in the data attribute of the Vue instance.

In addition to using the "$data" attribute, we can also directly use the variable name of the Vue instance to access the data attribute. The following code shows how to directly access the data attribute through the variable name of the Vue instance:

console.log(app.message);

In the above code, we directly use the variable name "app" of the Vue instance, and then add the variable of the data attribute Name "message" to access the variables in the data attribute.

In addition, we can also use the "this" keyword in the Vue instance to access the data attribute of the Vue instance. The following code shows how to use "this" to access the data attribute of the Vue instance:

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  },
  mounted: function () {
    console.log(this.message)
  }
})

In the above code, we use the "this" keyword in the Vue instance, and then add the data attribute Variable name "message" to access the data in this instance.

To summarize, to access the data attribute of the Vue instance, we can use the "$data" attribute of the Vue instance to access it, or we can directly use the variable name of the Vue instance and the variable name of the data attribute to access it. At the same time, we can Use the "this" keyword to access it in the Vue instance. These methods can successfully access the data attribute of the Vue instance.

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