vue中使用element ui的dialog问题

<el-dialog
  title="提示"
  :visible.sync="dialogVisible"
  width="30%"
  :before-close="handleClose">
  <span>这是一段信息</span>
  <span slot="footer" class="dialog-footer">
    <el-button @click="dialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="dialogVisible = false">确 定</el-button>
  </span>
</el-dialog>

添加一个变量设置为false就可以关闭，

 :visible.sync="visible"

参考：

<template>
  <el-dialog
    :title="!dataForm.areaId ? '新增' : '修改'"
    :close-on-click-modal="false"
    :visible.sync="visible"
    width="50%"
  >
    <el-form ref="dataForm" :model="dataForm" :rules="dataRule" label-width="100px" style="width:95%;" @keyup.enter.native="dataFormSubmit()">
      <el-row>
        <el-col :span="24">
          <el-form-item label="考区名称" prop="areaName">
            <el-input v-model="dataForm.areaName" placeholder="请输入考区名称" />
          </el-form-item>
        </el-col>
        <el-col :span="24">
          <el-form-item label="排序" prop="seq">
            <el-input v-model="dataForm.seq" placeholder="请输入排序" />
          </el-form-item>
        </el-col>
      </el-row>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button type="danger" @click="visible = false">取 消</el-button>
      <el-button type="primary" @click="dataFormSubmit()">确 定</el-button>
    </span>
  </el-dialog>
</template>
<script>
import { getInfo, add, edit } from '@/api/sys/area'
export default {
  data() {
    return {
      visible: false,
      dataForm: {
        areaId: '',
        areaName: '',
        seq: '1'
      },
      dataRule: {
        areaName: [
          { required: true, message: '考区名称不能为空', trigger: 'blur' }
        ],
        seq: [
          { required: true, message: '排序不能为空', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    init(id) {
      this.dataForm.areaId = id
      this.visible = true
      this.resetForm('dataForm')
      this.dataForm.seq = 1
      if (this.dataForm.areaId) {
        getInfo(id).then(res => {
          if (res && res.code === 200) {
            this.dataForm.areaId = res.data.areaId
            this.dataForm.areaName = res.data.areaName
            this.dataForm.seq = res.data.seq
          }
        })
      }
    },
    // 表单提交
    dataFormSubmit() {
      this.$refs['dataForm'].validate((valid) => {
        if (valid) {
          const param = {
            'areaId': this.dataForm.areaId,
            'areaName': this.dataForm.areaName,
            'seq': this.dataForm.seq
          }
          if (!this.dataForm.areaId) {
            add(param).then(res => {
              this.returnResponse(res)
            })
          } else {
            edit(param).then(res => {
              this.returnResponse(res)
            })
          }
        }
      })
    }
  }
}
</script>

this.$emit("closeDialog");

// 父组件
closeDialog() {
this.dialogVisible = false;
}