Progress of Vue3 relative to Vue2: Faster rendering performance
Vue.js is by far one of the most popular JavaScript frameworks, and it is able to manage and render user interfaces very well. Vue3 is the latest version of Vue.js. Compared with Vue2, it has significantly improved rendering performance.
Vue2 uses a responsive system based on Object.defineProperty. This kind of system can cause performance problems for large applications. However, Vue3 redesigned its responsive system and implemented it using Proxy, which greatly improved rendering performance. Below we will compare the rendering performance of Vue2 and Vue3 through sample code.
First, let’s look at the basic example of Vue2:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Vue2 Demo</title>
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>
<body>
<div id="app">
<p>{{ message }}</p>
<button @click="updateMessage">Update Message</button>
</div>
<script>
new Vue({
el: '#app',
data: {
message: 'Hello Vue2!'
},
methods: {
updateMessage() {
this.message = 'Updated!'
}
}
})
</script>
</body>
</html>Next, let’s look at the basic example of Vue3:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Vue3 Demo</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<p>{{ message }}</p>
<button @click="updateMessage">Update Message</button>
</div>
<script>
const { createApp, reactive } = Vue;
const app = createApp({
setup() {
const data = reactive({
message: 'Hello Vue3!'
});
const updateMessage = () => {
data.message = 'Updated!';
}
return {
message: data.message,
updateMessage
}
}
});
app.mount('#app');
</script>
</body>
</html>As can be seen from the above code example, The initialization part of Vue3 requires the use of the createApp function to create a Vue instance, and there is no need to use new Vue. In the setup function, we use the reactive function to set the data to be reactive. This means we can access the data directly without using the this keyword.
Compared with Vue2, Vue3 uses Proxy to implement a responsive system, which makes Vue3 more efficient than Vue2 when handling large applications. The rendering performance improvement of Vue3 is not only reflected in the initialization phase, but also includes the subsequent update process. In Vue3's responsive system, the virtual DOM will only be updated when the corresponding data is accessed.
To sum up, Vue3 has a significant improvement in rendering performance compared to Vue2. By redesigning the responsive system and using Proxy instead of Object.defineProperty, Vue3 can better handle the rendering performance issues of large applications. This makes Vue3 the preferred framework for developers to build efficient and elegant user interfaces.
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