postMessage跨域传参

http://127.0.0.1:8888/A.html

<script>
$(function(){
   const result = window.open('http://127.0.0.1:9999/B.html')
   if (result) {
	  const param = {
		type: 'customParam',
		param: '123456'
	  }
	  setTimeout(() => {
		result.postMessage(param, 'http://127.0.0.1:9999/B.html')
		console.log('已发送')
	  }, 500)
    }
 
})