What is the use of scoped in vue

scoped is used in Vue to limit CSS styles to only the current component and its internal elements, prevent style pollution and conflicts by adding unique prefixes, and simplify component development.

The role of scoped in Vue

scoped is a property in Vue that is used to limit CSS styles to only apply to The current component and its inner elements.

How to use scoped

In the component template, just use the scoped attribute:

<template scoped>
  <!-- CSS 样式只作用于当前组件内部 -->
</template>

Principle of action

When using scoped, Vue will automatically add a unique prefix to all CSS styles within the component template, ensuring that these styles only affect the current component and its internal elements. No other components will be affected.

Advantages

Using scoped has the following advantages:

• Improving the maintainability of CSS: By limiting CSS styles within components, you can prevent style pollution and improve code reusability.
• Reduce CSS conflicts: Especially in large applications, Scoped CSS can prevent CSS conflicts between different components.
• Simplify component development: It allows developers to focus on the style of the current component without worrying about the impact of other components.

Example

The following example shows how to use scoped:

<template scoped>
  <div class="my-component">
    <!-- CSS 样式只作用于此组件内部 -->
  </div>
</template>

Note:

• scoped is limited to CSS styles, it does not affect JavaScript code.
• scoped Styles can still use Vue’s CSS variables and media queries.
• If you need to share styles between multiple components, you can use a global CSS file or Vue's CSS preprocessing function (such as Sass or Stylus).

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