父组件传给子组件 props里的属性不能在子组件中修改

父组件传递数据给子组件 props里的属性不能在子组件中修改

问题：dialog对话框只能打开一次
子组件

<template>
  <div>
  <el-button @click="edit">编 辑</el-button>
    <!-- Form -->
    <el-dialog title="收货地址" :visible.sync="dialogFormVisible">
      <el-form :model="form">
        <el-form-item label="活动名称" :label-width="formLabelWidth">
          <el-input v-model="form.name" autocomplete="off" />
        </el-form-item>
        <el-form-item label="活动区域" :label-width="formLabelWidth">
          <el-select v-model="form.region" placeholder="请选择活动区域">
            <el-option label="区域一" value="shanghai" />
            <el-option label="区域二" value="beijing" />
          </el-select>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="cancel">取 消</el-button>
        <el-button type="primary" @click="confirm">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>
export default {
  props: {
    dialogFormVisible: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      form: {
        name: '',
        region: ''
      },
      formLabelWidth: '120px'
    }
  },
  methods: {
    cancel() {
      this.$emit('cancel')
    },
    confirm() {
      this.$emit('confirm')
    },
    edit() {
      this.$emit('edit')
    }
  }
}
</script>

父组件

<template>
  <div>
      <insertDialog :dialog-form-visible="dialogFormVisible" @cancel="cancel"      @confirm="confirm" @edit="edit"/>
  </div>
</template>
<script>
import insertDialog from './moudle-binding-insert/insert-tableDialog'
export default {
  components: {
    insertDialog
  },
  data() {
    return {
      dialogFormVisible: false
    }
  },
  methods: {
    edit() {
      this.dialogFormVisible = true
    },
    cancel() {
      this.dialogFormVisible = false
    },
    confirm() {
      this.dialogFormVisible = false
    }
  }
}
</script>
<style lang="scss" scoped>
.container {
    display: flex;
    justify-content: flex-start;
  }
</style>