Where to put the js code written in vue

JavaScript code is usually placed in the <script> tag in Vue.js, or it can be placed in an external JavaScript file or .vue file. Vue 3 and above supports placing JavaScript logic in the setup() function. Other placement locations include mixins, plugins, and global installations. </script>

Location of JavaScript code in Vue.js

In Vue.js, JavaScript code is usually placed below Location:

1. <script></script> Tag

This is the most common way to place JavaScript code in a component. The <script></script> tag should be placed after the <template></template> tag, as shown below:

<template>
  <!-- HTML 模板 -->
</template>

<script>
  export default {
    // 组件选项
    data() {
      return {
        // 数据
      }
    },
    methods: {
      // 方法
    }
  }
</script>

2. External JavaScript files

For larger or complex components, it may be more convenient to place the JavaScript code in a separate external file. External files can be imported into the <script></script> tag using the src attribute, as shown below:

<script src="./my-component.js"></script>

3. .vue Files

Single-file components (.vue files) in Vue.js combine HTML, CSS, and JavaScript code in a single file. JavaScript code sections can be written as in <script></script> tags.

4. setup() Function

In Vue 3 and above, the JavaScript logic of the component can be placed setup() function. setup() The function returns a reactive object containing component options.

const MyComponent = {
  setup() {
    const count = ref(0)
    const increment = () => count.value++

    return { count, increment }
  }
}

5. Other locations

In some cases, you may need to place the JavaScript code in other locations, such as:

• mixins: Used to share code between multiple components.
• plugins: Used to add custom functionality to Vue instances.
• Global installation: Used to use code in all components.

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