Why return in vue

Introduction

In Vue.js, you sometimes see the return statement being used to return certain values. Beginners may find this a bit strange because it is not clearly stated what is returned. Why is the return statement used in Vue? This article will delve into this issue.

The return statement in Vue

Although Vue.js is a framework, its bottom layer is based on JavaScript. This means that it does not change the basic characteristics and grammatical rules of the JavaScript language. Therefore, using return statements in Vue components is nothing special.

So, what are the specific uses of the return statement in Vue? Simply put, the return statement can be used to return some value, which can be data, functions, objects, or anything else that can be interpreted by the JavaScript interpreter.

But in Vue components, the return statement is not only used to return certain values, it also has other functions. Through the return statement, Vue components can define their own templates and styles, as well as the component's data, methods, and other configuration options.

Specific implementation

In the Vue component, you can export a JavaScript object through export default {}. This JavaScript object is the definition of the Vue component.

For example, the following example:

export default {
  data() {
    return {
      msg: 'Hello World!'
    }
  },
  methods: {
    sayHello() {
      alert(this.msg)
    }
  },
  template: '<button @click="sayHello">{{msg}}</button>'
}

The above code will define a button component. Clicking the button will pop up a prompt box to display Hello World!.

It should be noted here that the attributes data, methods, and template are all configuration options of the Vue component. Through these configuration options, we can define the component's data and methods, as well as the component's template and style.

In components, the return statement is used to return configuration options such as data, methods, and templates, indicating that these options are part of the component. In actual applications, the contents of these configuration options will be rendered into DOM elements in the HTML page.

In addition to configuration options such as data, methods, and template, Vue components can also define some other configuration options, such as props, computed, watch, etc. These configuration options can be returned through the return statement, indicating that they are part of the component.

Summary

In Vue.js, the return statement has the function of defining components. Through the return statement, we can define the data, methods, templates, styles and other configuration options of a Vue component, so that the component can be rendered on the page.

The development of Vue components requires proficiency in the syntax and features of JavaScript and Vue.js. If you are a beginner, it is recommended to learn the basics of JavaScript and Vue.js before starting to develop Vue components.

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