vue3 自定义指令 + 自定义组件 v-loading

自定义组件：

<template>
  <div class="loading">
    <div class="loading-content">
      <img width="24" height="24" src="./loading.gif">
      <p class="desc">{{title}}</p>
    </div>
  </div>
</template>

<script>
  export default {
    name: 'loading',
    data() {
      return {
        title: '正在载入...'
      }
    },
    methods: {
      setTitle(title) {
        this.title = title
      }
    }
  }
</script>

<style lang="scss" scoped>
  .loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    .loading-content {
      text-align: center;
      .desc {
        line-height: 20px;
        font-size: $font-size-small;
        color: $color-text-l;
      }
    }
  }
</style>

自定义指令：

指令封装：

create-loading-like-directive.js

import { createApp } from 'vue'
import { addClass, removeClass } from '@/assets/js/dom'

const relativeCls = 'g-relative'

export default function createLoadingLikeDirective(Comp) {
  return {
    mounted(el, binding) {
      console.log(el, binding)
      const app = createApp(Comp)
      console.log(app)
      const instance = app.mount(document.createElement('div'))
      console.log(instance)
      const name = Comp.name
      if (!el[name]) {
        el[name] = {}
      }
      el[name].instance = instance
      const title = binding.arg
      if (typeof title !== 'undefined') {
        instance.setTitle(title)
      }

      if (binding.value) {
        append(el)
      }
    },
    updated(el, binding) {
      const title = binding.arg
      const name = Comp.name
      if (typeof title !== 'undefined') {
        el[name].instance.setTitle(title)
      }
      if (binding.value !== binding.oldValue) {
        console.log(binding.value)
        binding.value ? append(el) : remove(el)
      }
    }
  }

  function append(el) {
    const name = Comp.name
    const style = getComputedStyle(el)
    console.log(style.position)
    if (['absolute', 'fixed', 'relative'].indexOf(style.position) === -1) {
      addClass(el, relativeCls)
    }
    el.appendChild(el[name].instance.$el)
  }

  function remove(el) {
    const name = Comp.name
    removeClass(el, relativeCls)
    el.removeChild(el[name].instance.$el)
  }
}

引用的js  dom.js

export function addClass(el, className) {
  if (!el.classList.contains(className)) {
    el.classList.add(className)
  }
}

export function removeClass(el, className) {
  el.classList.remove(className)
}

自定义组件的封装使用：

directive.js

import Loading from './loading'
import createLoadingLikeDirective from '@/assets/js/create-loading-like-directive'

const loadingDirective = createLoadingLikeDirective(Loading)

export default loadingDirective

在项目使用 ：

main.js  引入

createApp(App).use(store).use(router).use(lazyPlugin, {
  loading: require('@/assets/images/default.png')
}).directive('loading', loadingDirective).directive('no-result', noResultDirective).mount('#app')

项目组件使用：

<div class="recommend" v-loading="loading">
。。。。。。。。。。。
</div>