What is front-end vue.js

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When using v-for to traverse objects in Vue.js, you can get the value, key and index of the object through (value, key, index); 1. The basic syntax is suitable for displaying dynamic data such as user information or configuration items; 2. Notes include that you must set a unique: key attribute, usually using the key name as the key; 3. If you need to control the order, the object should be converted into an array and sorted manually, because the order of the object attributes may not be fixed in some cases; 4. In actual applications, it is suitable for displaying dynamic fields in back-end, such as user information or form data, to improve development efficiency.

When using environment variables in Vue and Vite projects, only variables prefixed with VITE\_ can be accessed on the client side. 1. Create .env files (such as .env, .env.development, .env.production, etc.) in the project root directory, and Vite will load the corresponding files according to the current mode; 2. Variables must be prefixed with VITE\_ (such as VITE\_API\_URL), otherwise they will not be exposed to the browser; 3. Access variables through import.meta.env in the code, such as console.log(import.meta.env.VITE\_API\_URL); 4. Different environment configurations should use the corresponding

To solve the font problem in Vue construction, you must first make sure that the font file is correctly processed by Webpack. 1. Check whether vue.config.js has disabled font-related loaders; 2. Set the font path reasonably and use the src/assets directory or public/index.html to introduce CDN fonts; 3. If the path is wrong after construction, check the publicPath settings and the font file size limit configuration to ensure that the path is correct and the resource is loaded correctly.

In Vue, rendering functions are suitable for packaging components that require dynamic selection of tags, creating transparent pass attributes, or optimizing performance. 1. The rendering function uses JavaScript to return virtual DOM nodes to replace template syntax; 2. Use the h() function to create VNodes, accept tag names, attribute objects and child nodes; 3. You can manually process slot content and dynamically switch components; 4. Applicable to UI library components, transition packaging or portal components; 5. Note that performance is not always improved, and you need to use it reasonably to avoid excessive nesting, and correctly pass $attrs and $listeners.