iframe跨域传值

parent 页面 localhost:8080

<iframe src="http://localhost:8081"></iframe>

<script>
// window.addEventListener("message", function(event) {
//     console.log('child', event.data)
// })
$(window).on('message', function(event) {
    console.log('child', event.originalEvent.data)
})
</script>

child 页面 localhost:8081

<script>
window.top.postMessage({
    msg: 'hello world'
}, '*')
</script>

https://developer.mozilla.org/zh-CN/docs/Web/API/Window/postMessage