text: let obj = {
      name: 'mhy',
      age: 23,
      detail: {
          city: 'beijing',
          school: 'csu'
      }
  }
  let evt = new Event('haha')
  function handler(e) {
      let o = e.eventBody
      console.log('addevt', o)
      console.log('evt', evt)
  }
  document.addEventListener('haha', handler, false)
  function disPatchEvt(obj) {
  	evt.eventBody = obj
  	document.dispatchEvent(evt, obj)	
  }
  disPatchEvt(obj)
  