vue3点击出现弹窗后背景变暗且不可操作的实现代码

<template>
  <div class="bg-cover" v-if="showCover"></div>
  <div class="column" style="width: 25px;">
  	<q-btn v-for="n in 12" round :color="'teal-'+n" icon="add" class="q-ma-lg"/>
  </div>
  <q-btn round color="primary" icon="add" size="24px" class="fixed-bottom-right q-ma-lg" @click="OpenAddTask()" @closeAddTask="closeAddTask" />
  <AddTask :showAddTask.sync="AddTaskFlag" class="addtask-box" @closeAddTask="closeAddTask"></AddTask>
</template>

<script setup>
import { ref } from "vue";
import AddTask from '../components/AddTask.vue'

//添加任务弹窗
let AddTaskFlag = ref(false);
let showCover = ref(false);

function OpenAddTask(){
  AddTaskFlag.value = true;
  showCover.value = true;
  document.body.style.overflow = "hidden"
}
function closeAddTask(){
  AddTaskFlag.value = false;
  showCover.value = false;
  document.body.style.overflow = "auto"
}

</script>

<style scoped lang="scss">

.addtask-box{
  z-index: 99;
  top: 300px;
}

.bg-cover {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, .8);
  z-index: 98;
}
</style>

<template>
  <div class="bg-cover" v-if="showCover"></div>
</template>

<script setup>
const props = defineProps(['showCover'])
</script>

<style scoped lang='scss'>
.bg-cover {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, .8);
  z-index: 98;
}
</style>

<template>
    <BgCover :showCover.sync="showCoverFlag"></BgCover>
    <div class="column" style="width: 25px">
        <q-btn v-for="n in 12" round :color="'teal-' + n" icon="add" class="q-ma-lg" />
    </div>
    <q-btn round color="primary" icon="add" size="24px" class="fixed-bottom-right q-ma-lg" @click="OpenAddTask()"
        @closeAddTask="closeAddTask" />
    <AddTask :showAddTask.sync="AddTaskFlag" class="addtask-box" @closeAddTask="closeAddTask"></AddTask>
</template>

<script setup>
import { ref } from "vue";
import AddTask from "../components/AddTask.vue";
import BgCover from "../components/BgCover.vue";

//添加任务弹窗
let AddTaskFlag = ref(false);
let showCoverFlag = ref(false);

function OpenAddTask() {
    AddTaskFlag.value = true;
    showCoverFlag.value = true;
    document.body.style.overflow = "hidden";
}
function closeAddTask() {
    AddTaskFlag.value = false;
    showCoverFlag.value = false;
    document.body.style.overflow = "auto";
}
</script>

<style scoped lang="scss">
.addtask-box {
    z-index: 99;
    top: 300px;
}

</style>

<template>
    <div class="column" style="width: 25px">
        <q-btn v-for="n in 12" round :color="'teal-' + n" icon="add" class="q-ma-lg" />
    </div>
    <q-btn round color="primary" icon="add" size="24px" class="fixed-bottom-right q-ma-lg" @click="OpenAddTask()"
        @closeAddTask="closeAddTask" />

    <q-dialog v-model="AddTaskFlag" persistent>
        <AddTask :showAddTask.sync="AddTaskFlag" class="addtask-box" @closeAddTask="closeAddTask"></AddTask>
    </q-dialog>

</template>

<script setup>
import { ref } from "vue";
import AddTask from "../components/AddTask.vue";

//添加任务弹窗
let AddTaskFlag = ref(false);

function OpenAddTask() {
    AddTaskFlag.value = true;
}
function closeAddTask() {
    AddTaskFlag.value = false;
}
</script>

<style scoped lang="scss">
.addtask-box {
    z-index: 99;
    top: 300px;
}
</style>