数组转字符串，字符串转数组

接口数据为字符串，字符串转对象

                      // 字符串转数组
          const StringToArray = res.data.data.deliveryUserGroup.split(',')
          this.formData.deliveryUserGroup = StringToArray

对象数据转字符串

formData.deliveryUserGroup = formData.deliveryUserGroup.join(',')

const data = {
      status: 0,
      id: this.type.id
    }
    const formData = JSON.parse(JSON.stringify(this.formData))
    // 草稿状态
    if (this.status === '0') {
      formData.deliveryUserGroup = formData.deliveryUserGroup.join(',')
    }
    Object.assign(data, formData)
    console.log(data)