vue实现表单未编辑或未保存离开弹窗提示功能

<template>
 <div>
  <q-dialog :persistent="true" v-model="alert">
   <q-card style="width:340px;">
    <q-card-section>
     <q-btn icon="close" flat round dense v-close-popup class="float-right" />
    </q-card-section>

    <q-card-section class="q-pt-none text-center" style="margin-: 10px;">
     当前数据未保存，是否离开？
    </q-card-section>

    <q-card-actions align="right">
     <q-btn
      flat
      label="是"
      color="primary"
      v-close-popup
      @click="handleConfirm"
     />
     <q-btn flat label="否" v-close-popup />
    </q-card-actions>
   </q-card>
  </q-dialog>
 </div>
</template>

<script>
export default {
 name: 'LeaveTipDialog',
 props: {
 },
 data () {
  return {
   alert: false
  }
 },
 methods: {
  init () {
   this.alert = true
  },
  handleConfirm () {
   // 提交父组件的事件
   this.$emit('handleConfirm')
  }
 }
}
</script>

<style lang="stylus">

</style>

watch: {
  datas: {
   handler (val) {
    if (val) {
     this.count++
    }
   },
   deep: true
  }
 },

<template>
 <div>
  <q-dialog :persistent="true" v-model="visible">
   <q-card class="card">
    <q-card-section
     transition-hide="flip-up"
     class="row items-center q-pb-none"
     style="padding-: 10px;"
    >
     <div class="text-h6">{{ isEdit ? "编辑" : "创建" }}xxxx</div>
     <q-space />
     <q-btn icon="close" flat round dense @click="close" />
    </q-card-section>
    <q-card-section class="form">
     <div class="line"></div>
     <q-form ref="form">
     <!-- 省略了表单行 -->
     </q-form>
    </q-card-section>
   </q-card>
  </q-dialog>
  
    <!-- 弹窗 关闭 编辑/创建时 确认离开-->
  <LeaveTipDialog
   v-if="leave"
   ref="leave"
   @handleConfirm="handleLeave"
  ></LeaveTipDialog>
 </div>
</template>

import LeaveTipDialog from 'ponents/LeaveTipDialog'
props: {
  isEdit: {
   type: Boolean,
   required: true,
   default: false
  }
 },
 ponents: {
  LeaveTipDialog
 },
 data () {
  return {
   visible: false,
   form: {
   // .... 具体省略
   },
   count: 0, // form数据修改的数量
   leave: false
  }
 },
 watch: {
  form: {
   handler (val) {
    if (val) {
     this.count++
    }
   },
   deep: true
  }
 },

methods: {
  close () {
   // console.log(`isEdit:${this.isEdit}:${this.count}`)
   if (this.isEdit && this.count > 1) {
    // 编辑 数据有修改弹出提示
    this.leave = true
    this.$nextTick(() => {
     this.$refs.leave.init()
    })
   } else if (!this.isEdit && this.count > 0) {
    // 新建 数据有修改弹出提示
    this.leave = true
    this.$nextTick(() => {
     this.$refs.leave.init()
    })
   } else {
    this.resetForm()
    this.leave = false
    this.visible = false
   }
  },
  handleLeave () {
   this.resetForm()
   this.leave = false
   this.visible = false
  },
  resetForm(){
    // this.form.xxxx = '' // 表单数据清空
    this.count = 0
  }
 }