vue3+TS实现自定义指令长按触发绑定的函数

import { ObjectDirective } from 'vue'

const LongPress: ObjectDirective = {
  // 组件mounted时执行指令
  mounted(el, binding, vnode) {
    // 确保提供的表达式是函数
    if (typeof binding.value !== 'function') {
      // // 将警告传递给控制台
      let warn = `[longpress:] provided expression '${binding.value}' is not afunction, but has to be `
      console.log(warn)
    } else {
      console.table({ el, binding, vNode })
      let timer: ReturnType<typeof setTimeout> | null = null  //定义空 定时器
      const start = (e: MouseEvent | TouchEvent) => {
        console.log(e)
        //下列事件不执行1.不是鼠标左键2.单击事件  (3.没有传入长按时间 ?? 有默认)
        if ((<MouseEvent>e).button !== 0 && e.type === 'click') {
          return
        }
        if (timer == null) {
          timer = setTimeout(() => {
            handler()
          }, Number(binding.arg) * 1000 ?? 0.5 * 10000) //默认长按0.5秒执行绑定的函数
        }
      }
      const cancel = () => {
        if (timer !== null) {
          clearTimeout(timer)
          console.log(timer);//定时器默认返回一个随机的number 这个number的值是这个定时器的id
          timer = null
        }
      }
      const handler = () => {
        binding.value()
      }
      // 添加事件监听器
      el.addEventListener('mousedown', start)
      el.addEventListener('touchstart', start)
      // 取消计时器
      el.addEventListener('click', cancel)
      el.addEventListener('mouseout', cancel)
      el.addEventListener('touchend', cancel)
      el.addEventListener('touchcancel', cancel)
    }
  },
}

export default LongPress

import { createApp } from 'vue'
import App from './App.vue'
import LongPress from './directives/longpress'

const app = createApp(App)
app.directive('longPress',LongPress)
app.mount('#app')

<template>
  <div>
    <button v-longPress = 'longFunc,1' >longPress</button>
  </div>
</template>

<script setup lang="ts">
const longFunc = () => {
  console.log('click long btn');
  alert('click long btn')
}
</script>

<style scoped>

</style>