10 Essential Vue.js Interview Questions *

A slot is a placeholder in a child component that is filled with content passed from the parent. Content of a regular slot is compiled in the parent’s scope and then passed to the child component.

因此，你不能在slot的内容中使用子组件属性. But scoped slots allow you to pass child component data to the parent scope and then use that data in slot content.

在Vue实例的data选项中定义的所有属性都是 reactive, meaning that if they change, the component is automatically updated and re-rendered as needed.

All such properties are converted to getters and setters during initialization, 从而允许Vue检测这些属性何时被访问或更改.

在设计Vue应用程序时，必须考虑以下限制:

• Vue cannot detect object property addition or deletion due to a JavaScript limitation, so the Vue.set 方法添加新的根级反应性属性时必须使用.
• 类似地，Vue无法检测何时使用索引修改数组项. Vue.set must be used here as well.

Mixin support is a feature that allows code reuse between components in a Vue.Js应用程序和软件组合工具.

A mixin is a JavaScript object that can contain any option that a component can contain. All mixin content is merged with a component’s options when that component uses a mixin.

Mixins有助于遵循DRY(不要重复自己)原则. mixin甚至可以全局地应用于每个组件实例. 在这种情况下，它被称为全局mixin.

Mixins是一个强大的工具，但在使用它们时需要谨慎. As with all injected code, we should be careful to avoid maintenance issues and unexpected behavior.

It helps to implement mixins using pure functions that don’t modify anything outside their own scope.

Global mixins should be avoided, as affecting every single component can lead to maintenance issues as an application grows. Injecting specific mixins to components as needed leads to more maintainable code.

单文件组件是一个带有 .vue 包含Vue组件的扩展. It contains the component’s template, logic, and styles all bundled together in one file. It consists of one