Method mod

src/services/msgService.js:44–53

* 修改 msg * @param {Object} msgBody { title:{String}, content:{String} } * @return {Promise}

(msgBody)

   * @return {Promise}
   */
  mod (msgBody) {
    let msgId = msgBody.id
    delete msgBody.msgId

    return xhr({
      method: 'put',
      url: `/msg/${msgId}`,
      body: msgBody
    })
  }

  /**
   * 删除 msg