element中组件的Message只会弹出一个

只需在Vue项目的main.js中加上以下设置即可：

const showMessage = Symbol('showMessage')
/**
 *  重写ElementUI的Message
 *  single默认值true，因为项目需求，默认只弹出一个，可以根据实际需要设置
 */
class DonMessage {
  success (options, single = true) {
    this[showMessage]('success', options, single)
  }
  warning (options, single = true) {
    this[showMessage]('warning', options, single)
  }
  info (options, single = true) {
    this[showMessage]('info', options, single)
  }
  error (options, single = true) {
    this[showMessage]('error', options, single)
  }
  [showMessage] (type, options, single) {
    if (single) {
      // 判断是否已存在Message
      // if (document.getElementsByClassName('el-message').length === 0) {
      Message.closeAll()
      Message[type](options)
      // }
    } else {
      Message[type](options)
    }
  }
}

Vue.prototype.$message = new DonMessage()