组合函数就是将逻辑抽离成独立函数，供多个组件复用。
典型特征：
- 命名以 use 开头
- 内部使用 ref/reactive 管理响应式状态
- 可返回状态、方法、生命周期逻辑
封装模板：
ts
复制编辑
export function useCounter(init = 0) {
const count = ref(init)
const inc = () => count.value++
const reset = () => (count.value = init)
return { count, inc, reset }
}
推荐使用场景：
- 表单处理逻辑
- 本地缓存逻辑（如草稿）
- 页面切换控制、滚动事件处理
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