Changes in Vue3 compared to Vue2: better cross-platform development capabilities

Vue.js, as a popular front-end framework, has always been widely loved and used. Based on Vue2, Vue3 brings many new changes and functional improvements. This article will discuss the changes in Vue3 compared to Vue2, focusing on its better cross-platform development capabilities.

1. Combined API
Vue3 introduces the combined API, which is a new code organization method that allows developers to better organize and reuse logic. Different from using Options API to define component logic in Vue2, the combined API can more freely combine and reuse different logic fragments, making the code more modular and readable. Let's look at a simple example:

import { ref, reactive, computed } from 'vue';

export default {
  setup() {
    const count = ref(0);
    const doubleCount = computed(() => count.value * 2);
    const state = reactive({
      name: 'Vue',
      version: 3
    });
    
    function increment() {
      count.value += 1;
    }

    return {
      count,
      doubleCount,
      state,
      increment
    }
  }
}

In the above code, we use the ref, reactive and computed functions to define variables and calculated properties, use the setup function to organize the logic, and finally return it to the template for use. This method is more free and flexible, and can better express the logic of components.

2. Better TypeScript support
Vue3’s support for TypeScript has also been greatly improved. In Vue2, additional compilation configuration and type declaration files are required to support TypeScript well, but in Vue3, support for TypeScript has been built in, and no additional configuration files are needed. In this way, we can use TypeScript to write Vue applications more conveniently, improving the maintainability and robustness of the code.

3. Faster rendering speed and smaller size
Vue3 has also been greatly improved in terms of performance. By optimizing the rendering function and cutting out some uncommon APIs, Vue3 renders faster than Vue2. In addition, Vue3 also uses a smaller runtime size, reducing dependence on external libraries and further improving application performance.

4. Better cross-platform development capabilities
Vue3 has also enhanced its capabilities in cross-platform development. In addition to being used in the web platform, Vue3 can also be used in desktop, mobile and native application development. Through Vue's renderer API, Vue3 components can be rendered to different platforms to achieve cross-platform development and reuse. Let's look at an example of rendering components to the desktop in Vue3:

import { createApp } from 'vue';
import App from './App.vue';
import { createRenderer } from '@vue/runtime-core';
import { createRouter } from './router';

const app = createApp(App);

const renderer = createRenderer({
  ...,
  render: (vnode, container) => {
    // 渲染到桌面端的代码
  }
});

app.config.globalProperties.$renderer = renderer;

app.use(createRouter());

app.mount('#app');

By using the renderer API and corresponding rendering functions, we can render Vue3 components to different platforms, achieving cross-platform Platform development and reuse.

To sum up, Vue3 has brought many new changes and functional improvements compared to Vue2, making us more flexible, efficient and faster in the development process. Especially in terms of cross-platform development, the improvement of Vue3 is very obvious, allowing us to better cope with the needs of multiple platforms. I believe that with the popularity and development of Vue3, more developers will choose to use Vue3 to build their own applications.

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