我正在創(chuàng)建一個反應應用程序，我希望我的用戶將其嵌入到他們的網(wǎng)站上。此應用程序?qū)@示在兩個 iframe 中，但我想一次只顯示一個 iframe。因此，該應用程序的一部分是一個簡單的按鈕，第二部分是一個表單，一旦用戶決定使用該應用程序（它是一個聊天應用程序）就會彈出。我設置了一個非常簡單的組件來顯示按鈕，以便它可以向父網(wǎng)站發(fā)送消息。我不確定自己做錯了什么，但是發(fā)送 window.postmessage 事件時，出現(xiàn)錯誤：Uncaught DOMException: Blocked a frame with origin "http://localhost:3002" from accessing a cross-origin frame.這是示例父網(wǎng)站代碼：<h1>Hello! This is some static content</h1>    <iframe src="http://localhost:3002"        style="width: 108px; height: 50px; padding: 0px; margin: 10px 20px; position: fixed; bottom: 0px; right: 0px; overflow: visible; opacity: 1; border: 0px; z-index: 999998; transition-duration: 250ms; transition-timing-function: cubic-bezier(0.645, 0.045, 0.355, 1); transition-property: opacity, top, bottom;"        id="dbhchat"></iframe>    <h3>Thanks for checking out my blog!</h3>    <script>        window.addEventListener('message', event => {            // IMPORTANT: check the origin of the data!             if (event.origin.startsWith('http://localhost:3002')) {                // The data was sent from your site.                // Data sent with postMessage is stored in event.data:                console.log(event.data);            } else {                // The data was NOT sent from your site!                 // Be careful! Do not use it. This else branch is                // here just for clarity, you usually shouldn't need it.                return;            }        });    </script>以及將消息發(fā)送到父窗口的組件：import React from 'react';import { IconButton } from '@material-ui/core';import PhotoCamera from '@material-ui/icons/PhotoCamera';import './App.css';function App() {  const send = () => {    if (window && window.parent) {      console.log('we have message sending here', window.parent);      window.parent.postMessage('message', 'http://localhost:3002', false);    }  }在此先感謝您提供幫助解決這個問題！