What is vue's downgrade processing?

With the continuous development of front-end technology, Vue.js is recognized and used by more and more developers. Vue.js is a lightweight JavaScript front-end development framework. Its main features are two-way data binding and componentization. Through Vue.js, we can make our page reconstruction easier and development faster. However, we will also face a series of problems when implementing Vue.js, one of which is downgrade handling.

Downgrade processing usually refers to a method of rendering pages in a way that is more consistent with the browser's capabilities when the browser does not support certain new technologies or when certain technologies are unavailable. In Vue.js, due to its API based on modern browsers, some features of Vue.js code may not work properly in some older browsers. Therefore, Vue.js provides some downgrade solutions.

Common methods of downgrade processing

In web development, we often use the terms "graceful degradation" and "progressive enhancement" to describe downgrade processing methods during the development process. Among them, "graceful degradation" refers to modifying the advanced features of the code into more general code so that it can render normally in older browsers, while "progressive enhancement" refers to using advanced features in newer browsers first. , and then gradually add support for earlier browsers.

In Vue.js, we usually use the following methods for downgrade processing:

Use polyfill

For the required browser functions, we can manually add polyfill to solve the problem . Polyfill is a JavaScript plug-in that provides new functionality that the browser does not have. The advantage of using polyfill is that it does not affect your use of new features and ensures compatibility with older browsers.

For example, if we want to use Promise in IE 11, then we can quote [es6-promise](https://github.com/stefanpenner/es6-promise):

import 'es6-promise/auto'

This library adds a window.Promise object and provides Promises as this object.

Manual changes

We can also make some manual changes to some properties or methods. For example, when using axios in IE 11, you need to change response.data to response.request.responseText:

axios.get('/api/user').then(response => {
  const data = response.request.responseText
  // ...
})

Use plugin

In Vue.js, you can use some plug-ins to handle some compatibility issues. For example, if you need to convert the new version of Vue code into ES5 code, you can use [vue-cli-plugin-babel](https://cli.vuejs.org/zh/guide/plugins-and-presets.html #plugin) plug-in for conversion:

vue add babel

This plug-in allows Vue.js to run normally on the ES5 browser.

Using Vuetify and Element UI

Vuetify and Element UI are both UI component libraries for Vue.js. They provide a series of Vue.js-based components and directives as well as virtual DOM encapsulation. These component libraries ensure normal use on various browsers and devices through their own downgrade handling and compatibility optimization.

Summary

Downgrade handling is a problem that Vue.js developers must face. We can solve compatibility issues by introducing polyfills, making manual changes, using plugins, and using UI component libraries. When using it, we need to understand the features and support levels of different browsers, and choose the most suitable downgrade solution for our project to ensure that our project can run normally on different browsers and devices.

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