Where does this in vue point to?

The this pointer in Vue depends on the context, usually pointing to the component instance (within the component) or the Vue instance (non-component context). Specific situations include: html templates, component methods, non-component functions, event handling functions, watch options, etc.

this in Vue points to

Vue, and the direction of this depends on its The specifics of the context. It may point to a different object, for example:

• Component instance: Inside a component, this points to the component instance itself. This means you can access the component's data, methods, and properties.
• Vue instance: In a non-component context, this points to a Vue instance. A Vue instance represents the entire Vue application, providing global state management and event handling.

Specific points

The following are some specific situations this points to:

• html In the template: this points to the component instance.
• in the component method: this points to the component instance.
• In non-component functions: this points to the Vue instance.
• In event handling function: this points to the component instance of the event target (if the target is a component).
• watch Options: this points to the Vue instance.

Examples

Here are a few examples showing where this points in different contexts:

// 组件中
this.name = 'John'; // 指向组件实例

// 非组件函数中
this.$store.dispatch('action'); // 指向 Vue 实例

// 事件处理函数中
this.$el.classList.add('active'); // 指向事件目标的组件实例

It should be noted that the pointing of this can be changed through techniques such as bind or arrow function. But in general, the rules listed above apply to this in Vue.

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