Changes in Vue3 compared to Vue2: better IE11 compatibility

Changes in Vue3 compared to Vue2: Better IE11 compatibility

Vue.js is a JavaScript framework used to build user interfaces. Its version 3 has more advantages than the previous version 2. Comes a series of changes and improvements. One of the most notable changes is better compatibility support for IE11. In this article, we will focus on this improvement and give some code examples to help you understand better.

In Vue2, the compatibility support for IE11 is not very good. This is an important issue for many projects because many companies and institutions still use the IE11 browser. In Vue3, the team specifically improved the compatibility of IE11, making Vue3 more friendly to interact with IE11.

First of all, Vue3 has made some important reconstructions for IE11 compatibility. It introduces a new compiler (v-d) that can generate code that can run in IE11. At the same time, some syntax and API have been updated to ensure that these codes can run normally in IE11. This allows developers to use more modern syntax and features in Vue3 without having to worry about compatibility issues.

Let’s take a look at a simple code example to experience Vue3’s IE11 compatibility improvements:

//定义一个Vue实例
const app = {
  data() {
    return {
      message: 'Hello, Vue3!'
    }
  },
  template: `
    <div>
      <p>{{ message }}</p>
    </div>
  `
}

// 渲染Vue实例
Vue.createApp(app).mount('#app')

In this example, we create a simple Vue instance and hang it Loaded to the DOM element with the id "app". In Vue3, we use the createApp method to create a Vue instance instead of the new Vue method in Vue2. This change is not for compatibility with IE11, but to make Vue's API clearer and consistent.

It should be noted that Vue3 needs to configure compatibility support for IE11 in the build tool. We can use the Babel plug-in @vue/cli-plugin-babel for support. Create a file named .babelrc in the root directory of the project and add the following code to the file:

{
  "presets": [
    [
      "@vue/cli-plugin-babel/preset",
      {
        "targets": {
          "ie": "11"
        }
      }
    ]
  ]
}

The above configuration will ensure that our project will generate IE11 when built Compatible code.

In addition to compatibility improvements, Vue3 also introduces some other new features and improvements, including a better responsive system, a more powerful composition API, stronger type derivation, etc. These new features make Vue3 more powerful and flexible when developing large and complex applications.

To sum up, Vue3 does bring many changes and improvements compared to Vue2, including better compatibility support for IE11. This is an important improvement for many projects as IE11 is still widely used. With improvements in Vue3, developers can build applications that work across different browser environments with greater confidence.

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