How to adapt vue to lower version browsers

With the rapid development of front-end technology, more and more websites and applications adopt new generation JavaScript frameworks like Vue to provide fast, maintainable, and scalable front-end solutions. However, due to some historical reasons and technical limitations, some users are still using lower versions of browsers. This leads to the question: how to properly run Vue applications in these older browsers?

In this article, we will discuss the adaptation problems and solutions of Vue in lower version browsers.

Why should we adapt to older versions of browsers?

Before understanding how Vue adapts to lower version browsers, we need to understand why we need to do this. There is no doubt that Vue is an excellent framework that provides powerful tools and features to simplify our process of building applications. However, whether we like it or not, we have to face reality: there are still a large number of users using outdated browsers.

According to Statcounter data, as of February 2021, more than 10% of users around the world still use the IE browser. If we don't adapt to older browsers, we'll lose those users, which will impact our website or app's traffic and revenue.

In addition, incompatibility with lower version browsers may also cause some functions to not run properly or errors to occur, thus affecting the user experience. This user experience is one of our core goals in optimizing websites or applications.

How to adapt to IE browser?

Vue only supports modern browsers by default, which means we need to take extra steps to be compatible with older browsers. Here are a few ways:

1. Use a CDN to introduce Polyfill

Polyfill is a code snippet that emulates the new JavaScript API in older browsers. The runtime version of Vue requires ES5 features. If we want to use Vue in older browsers, we need to insert Polyfill into the code.

We can use CDN to introduce Polyfill, such as polyfill.io. This service dynamically generates Polyfill code based on the user's browser version, so we only need to use simple code to be compatible with old browsers:

<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>

2. Use Babel to convert the code

Another way to be compatible with lower version browsers is to use Babel. Babel is a JavaScript converter that converts the ES6 code we write into ES5 code that older browsers can understand.

We need to install babel-preset-env and babel-loader plug-ins to make Vue support Babel. We set the following configuration in webpack.config.js:

module.exports = {
  // ...
  module: {
    rules: [
      {
        test: /.js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['env']
          }
        }
      },
      // ...
    ]
  }
};

In this configuration, we tell Webpack to use babel-loader to convert all .js files to ES5 for compatibility with older browsers.

3. Modify the packaging configuration

Vue CLI provides a configuration file vue.config.js, where we can make some custom settings. For example, we can add the transpileDependencies option here to tell Vue CLI to translate specified dependencies.

module.exports = {
  transpileDependencies: [
    'vue',
    'vuex',
    'vue-router'
  ]
};

Using this option, we can avoid common problems that cause problems in older browsers, such as undefined errors for Object.assign.

Conclusion

Polyfill, Babel and modifying the packaging configuration are three very useful methods when adapting Vue applications to be compatible with older browsers. We can choose different methods according to our specific situation. No matter which method we use, we should always consider the user experience to provide accessible, high-quality applications for all users.

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