不少初学者接触 Vue3 时，会觉得 setup()、ref()、reactive()、watchEffect()、defineExpose() 这些组合式 API 很“陌生”，甚至有些“麻烦”。
但实际上：
Vue3 并不比 Vue2 更复杂，而是更明确。
Vue2 的 Options API 把逻辑分散在 data、methods、computed、watch 中，写起来简单，但当组件变大时，维护非常混乱。
Vue3 用组合式 API 让所有相关逻辑聚合到一起，比如：
js
复制编辑
const count = ref(0)
const inc = () => count.value++
写在一起，逻辑清晰。尤其在大型项目中，你可以：
- 把功能分组（如网络请求、UI状态、表单逻辑）
- 抽离通用逻辑封装成 useXxx
- 实现更清晰的类型提示与结构规范
只要入手 2～3 个组合函数（ref、computed、watch），你就会发现 Vue3 并不难，它只是更“面向工程化”。
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