What are the caching mechanisms of Vue?

Vue caching mechanisms include instruction cache, component cache, asynchronous components, locally registered components, VNode cache, data cache, and instruction and component cache cleaning. Detailed introduction: 1. Instruction caching, Vue.js uses an instruction-based caching mechanism. During the compilation phase, the instruction converts the template into a rendering function and stores it in the inline instruction attribute of the element; 2. Component caching, Vue.js The component caching mechanism is used. When the component rendering is completed, the component instance will be saved in the Vue prototype so that it can be directly reused the next time it is used.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Vue.js is a popular JavaScript framework for building user interfaces. To improve performance and user experience, Vue.js provides multiple caching mechanisms. The following are some common caching mechanisms in Vue.js:

1. Instruction caching: Vue.js uses an instruction-based caching mechanism. During the compilation phase, the directive converts the template into a rendering function and stores it in the element's inline directive attribute. When the component is rendered again, it will check whether the corresponding rendering function already exists in the instruction cache. If it exists, the cached rendering function will be used directly to avoid repeated compilation processes.

2. Component caching: Vue.js uses a component caching mechanism. When the component rendering is completed, the component instance will be saved in the Vue prototype so that it can be directly reused the next time. If the component's name and data are completely consistent, the cached component instance can be used directly to avoid repeated rendering processes.

3. Asynchronous components: Vue.js also provides the concept of asynchronous components. Asynchronous components are components that are loaded only when needed. By using asynchronous loading, you can avoid loading a large number of components on the initial load, thus improving the startup speed of your application. Asynchronous components are implemented by dynamically importing modules. When a component needs to be loaded asynchronously, you can use the Vue.component method and add () after the name to indicate that the component is loaded asynchronously.

4. Locally registered components: In Vue.js, you can use the components option to register global components, or you can use the local method to register local components. Locally registered components will only be visible to the current component, avoiding naming conflicts and performance overhead caused by global registration.

5. VNode cache: Vue.js uses the concept of virtual DOM (VNode) during the rendering process. Each time it is rendered, Vue.js creates a new virtual DOM tree, compares the old virtual DOM tree with the new virtual DOM tree, and then uses the diff algorithm to calculate the difference and perform minimal DOM operations. In order to reduce the overhead of repeated virtual DOM creation and diff calculation, Vue.js provides a global variable named vnodes to store the created virtual DOM nodes. If the same virtual DOM tree as the previous one is found when rendering again, the previous virtual DOM node will be directly reused to avoid repeated creation and diff calculation.

6. Data caching: Vue.js implements a data responsive system through data hijacking technology. When data changes, Vue.js will automatically update related views through data hijacking technology. In order to avoid repeated update operations, Vue.js internally uses a global property called __vue__ to store hijacked data objects. When the same data object is modified again, Vue.js will directly reuse the previously hijacked data object, avoiding repeated data hijacking and view update operations.

7. Cleaning of directive and component cache: In Vue.js, when a component or directive is no longer needed, the cache can be cleared by calling the destroy method. This avoids useless memory usage and possible memory leaks.

To sum up, Vue.js improves performance and user experience through various mechanisms such as instruction caching, component caching, asynchronous components, locally registered components, VNode caching, data caching, and cleaning of instruction and component caches. . These caching mechanisms enable Vue.js to efficiently utilize resources and reduce unnecessary computing and rendering overhead when building complex user interfaces.

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