Improvements of Vue3 over Vue2: Easier to debug code

The progress of Vue3 relative to Vue2: easier to debug code

In recent years, Vue.js has become one of the most popular frameworks in front-end development. Vue2 is highly praised by developers for its simplicity, efficiency and ease of use. However, the release of Vue3 further improves developers' development experience and brings more convenient and efficient debugging functions. This article will introduce the improvements of Vue3 compared to Vue2, and use code examples to demonstrate its improvement in debugging capabilities.

The biggest improvement of Vue3 compared to Vue2 is the use of a completely rewritten code structure, that is, the use of a new responsive system-Vue's core reactivity. This new responsive system greatly optimizes the performance of Vue3 and provides developers with more intuitive and flexible debugging tools. Let's take a look at the debugging improvements of Vue3 compared to Vue2 through a sample code.

Suppose we have a simple Vue component that contains a button and a counter. When the user clicks the button, the counter number increases by one. First, let's take a look at the implementation in Vue2.

<template>
  <div>
    <button @click="increment">点击加一</button>
    <p>计数器: {{ count }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0
    };
  },
  methods: {
    increment() {
      this.count++;
    }
  }
};
</script>

In the above code, we implement the counter function through Vue's data binding and event listening. In Vue2, if we want to debug this code, we need to debug at the break point of the browser's developer tools, or add console.log to the code to output the corresponding variable values. This debugging method is cumbersome and not intuitive enough, especially when the code size becomes larger, it becomes more inconvenient to debug.

In Vue3, we can understand the status and status changes of components more directly through new debugging tools. Specifically, Vue3 provides us with a new composition API-@vue/composition-api, through which we can implement functions.

First of all, we need to use the Vue3.0 version. You can use the new composition API by installing @vue/composition-api. Let's take a look at sample code for implementing a counter using the composition API.

<template>
  <div>
    <button @click="increment">点击加一</button>
    <p>计数器: {{ count }}</p>
    <p>点击次数: {{ clickCount }}</p>
  </div>
</template>

<script>
import { reactive, ref, watch } from '@vue/composition-api';

export default {
  setup() {
    const count = ref(0);
    const clickCount = ref(0);

    function increment() {
      count.value++;
      clickCount.value++;
    }

    watch(count, (newCount) => {
      console.log('计数器值变化：', newCount);
    });

    return {
      count,
      clickCount,
      increment
    };
  }
};
</script>

In the above code, we create responsive state variables count and clickCount through the ref function. And, we used the watch function to monitor changes in count and print out the counter value on the console. In this way, when we click the button, we can see the changing value of the counter on the console in real time, allowing for better debugging.

As you can see, compared to Vue2, Vue3 uses the new combination API to allow us to track and debug state changes more intuitively. Since Vue3 encapsulates the responsive system into a functional form instead of an object form, we can better control and manage the state of components. In addition, Vue3 has also improved some other debugging tools, such as better error prompts and richer developer tool functions, further improving debugging efficiency and experience.

In summary, Vue3’s progress in debugging compared to Vue2 is mainly reflected in more intuitive and flexible debugging tools. The new combination API provides us with better status management and tracking capabilities, making debugging work more efficient and convenient. Although Vue2 is already a very excellent and mature framework, the improvement of Vue3's debugging function will undoubtedly bring better development experience and efficiency to developers.

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