The difference between Vue3 and Vue2: faster response speed

The difference between Vue3 and Vue2: faster response speed

Vue is a popular JavaScript framework for building user interfaces. Its smoothness and responsiveness are very important to developers and users. Based on Vue2, Vue3 has made some improvements to provide faster response speed. This article will explore the performance improvements of Vue3 over Vue2 and provide some code examples to illustrate these improvements.

1. Rewriting of the responsive system:
   Vue3 rewrites its responsive system and uses the Proxy proxy object instead of Vue2's Object.defineProperty(). This new responsive system makes Vue3 more efficient when accessing properties, thereby improving response speed.

The following is a code example using Vue3's responsive data:

import { reactive, watchEffect } from 'vue';

const app = reactive({
  count: 0
});

watchEffect(() => {
  console.log(app.count);
});

app.count++; // 输出 1

2. Static Tree Hoisting:
   Vue3 uses static tree hoisting With this technology, static nodes are processed in the compilation stage and efficient rendering code is generated. This way, Vue3 can calculate differences and update faster when dealing with dynamic nodes.

The following is a code example using Vue3's static tree promotion:

import { h } from 'vue';

const app = {
  render() {
    return h('div', { class: 'container' }, [
      h('h1', 'Hello Vue3'),
      h('p', 'Welcome to Vue3')
    ]);
  }
};

3. Compiler optimization:
   Vue3's compiler has been optimized, and the generated code More streamlined and efficient. For example, Vue3 enables static markup when compiling templates, thus avoiding unnecessary re-rendering.

The following is a code example using Vue3's compilation optimization:

import { createApp, h } from 'vue';

const app = createApp({
  template: `
    <div class="container">
      <h1 id="Hello-Vue">Hello Vue3</h1>
      <p>Welcome to Vue3</p>
    </div>
  `
});

app.mount('#app');

Summary:
Vue3 rewrites the responsive system, introduces static tree lifting and performs compiler optimization and other means to provide faster response speed. Developers can take advantage of Vue3's new features to improve application performance and provide a better user experience. Although migrating existing Vue2 projects to Vue3 may require some work, the performance improvement is worth a try.

I hope this article will help you understand the difference between Vue3 and Vue2. By using Vue3, you can build more efficient and smooth applications.

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