vue3中自定义hook的用法

hook 可以理解为类似于vue2中mixin 用法------------公共方法封装

hook优点：复用代码，让setup中的逻辑更通俗，更简洁

src下新建hook文件，hook 文件下新建 .js文件

举个例子： 需求：拿到鼠标的 x y 值

import { onBeforeUnmount, onMounted, reactive } from "vue";
export default function usePoint() {
  let point = reactive({
    x: 0,
    y: 0,
  });
  function savePoint(e) {
    point.x = e.pageX;
    point.y = e.pageY;
  }
  onMounted(() => {
    window.addEventListener("click", savePoint);
  });
  onBeforeUnmount(() => {
    //事件销毁
    window.removeEventListener("click", savePoint);
  });
  return point      // 把数据return出去
}

页面引入公共方法：usePoint

 
<script>
import usePoint from "../src/hooks/usePoint";
export default {
  setup() {
    let point1 = usePoint();
    return { usePoint, point1 };
  },
};
script>
 
<style>
style>