export const onMessage = function (eventName, cb) {
  window.parent.addEventListener('message', function (e) {  // 监听 message 事件
    if ( e.data) {
      const _eventName = e.data.type
      if (eventName === _eventName) {
        cb && cb(e.data.data)
      }
    }
  });
}

export function sendMessage (eventName, message) {
  window.postMessage({
    type: eventName,
    data: message
  }, '/')
}

export function sendSelfMessage (eventName, message) {
  window.postMessage({
    type: eventName,
    data: message
  }, '/')
}

window.sendSelfMessage = sendSelfMessage