electron-quick-start
/
popup_page.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>子窗口</title>
</head>
<body>
  <h2>这是弹出的子窗口</h2>
  <button onclick="sendMessageToParent()">向父窗口传递信息</button>
</body>
<script>
  function sendMessageToParent(){
    window.opener.postMessage("这是来自子窗口的问候");
    window.opener.postMessage({
      type: 1,
      message: "这是来自子窗口的问候"
    })

  }
</script>
</html>