Discussion question: Can external js modify vue data?

Vue is a popular JavaScript framework that provides us with a declarative, component-based way to build web applications. In Vue, we can easily manage and update the state of the application. However, in actual projects, we may need to use external JavaScript files to manipulate Vue's status data. This article will discuss this issue.

Can external JS modify Vue data?

The data in Vue is responsive. When the data changes, we can automatically update the DOM. Vue uses a mechanism called a "reactive system" to track data changes. This reactive system is encapsulated when using Vue so that we do not need to manually update the DOM. Moreover, Vue also provides life cycle hook functions, allowing us to perform some operations when components are created, mounted, updated, and destroyed. This mechanism ensures the synchronization of state data in Vue and the DOM.

However, in some cases, we may need to modify the state of Vue in an external JavaScript file, such as using Vue in a third-party plug-in. So, can external JavaScript files modify Vue's status data?

The answer is yes. Vue provides some APIs that allow us to directly access and modify Vue's state data in external JavaScript files.

Vue Data Access API

Vue provides some APIs that allow us to directly access and modify Vue's status data in external JavaScript files, for example:

• vue.$data: Access the data object in the Vue instance.
• vue.$props: Access the property object in the Vue instance.
• vue.$set: used to add a responsive property to an already created instance.
• vue.$delete: Used to delete attributes on objects that have added responsive attributes.

The following are examples of usage of these APIs:

// 访问Vue实例中的数据对象
console.log(vue.$data);

// 访问Vue实例中的属性对象
console.log(vue.$props);

// 在已经创建的实例上添加一个响应式属性
vue.$set(vue.someObject, 'someProperty', 'someValue');

// 删除已经添加了响应式属性的对象上的属性
vue.$delete(vue.someObject, 'someProperty');

In addition to these APIs, Vue also provides other APIs to access and modify Vue's status data. The specific use needs to be based on the actual situation. Make your selection.

Notes

Although external JS can modify Vue data, we need to pay attention to the following issues:

• Do not directly modify the data object in the Vue instance. Because this will violate Vue's responsive system and prevent the DOM from being automatically updated.
• Do not modify the component's state data after the component is destroyed.
• If you still need to access and modify the component's state data after the component is destroyed, you can use the global Vue instance to access it.

Summary

This article introduces the issue of whether external JS can modify Vue data, and provides usage examples of related APIs. In actual development, we need to weigh the pros and cons and choose whether to modify Vue data in external JS according to the specific situation to avoid unnecessary problems.

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