The Vue Ecosystem 2025 Complete Overview is becoming increasingly widespread in frontend development. This article dives deep into its core principles and best practices from real project experience.

Basic Usage

In real projects, the usage gets more complex:

import { ref, computed, watch, onMounted } from "vue";

export default {
  setup() {
    const count = ref(0);
    const doubled = computed(() => count.value * 2);

    watch(count, (newVal, oldVal) => {
      console.log(`count: ${oldVal} -> ${newVal}`);
    });

    onMounted(() => {
      console.log("Component mounted");
    });

    return { count, doubled };
  },
};

Through this approach, both testability and scalability of the code are improved.

Advanced Usage

Here is a complete example:

import { reactive, toRefs, computed } from "vue";

function useCounter(initial = 0) {
  const state = reactive({ count: initial, history: [initial] });
  const doubled = computed(() => state.count * 2);

  function increment() {
    state.count++;
    state.history.push(state.count);
  }

  return { ...toRefs(state), doubled, increment };
}

Pay attention to edge case handling — this is critical in production environments.

Practical Cases

The key is understanding the core logic:

import { ref, computed, watch, onMounted } from "vue";

export default {
  setup() {
    const count = ref(0);
    const doubled = computed(() => count.value * 2);

    watch(count, (newVal, oldVal) => {
      console.log(`count: ${oldVal} -> ${newVal}`);
    });

    onMounted(() => {
      console.log("Component mounted");
    });

    return { count, doubled };
  },
};

Performance optimization needs to be tailored to specific scenarios; not every situation requires over-optimization.

Performance Optimization

We can improve it in the following ways:

import { reactive, toRefs, computed } from 'vue'

function useCounter(initial = 0) {
  const state = reactive({ count: initial, history: [initial] })
  const doubled = computed(() => state.count * 2)

  function increment() {
    state.count++
    state.history.push(state.count)
  }