2-2.html - Android社区 - https://www.androidos.net.cn/

<html>
<head>
<script>
window.addEventListener("message", messageReceived, false);

function messageReceived(event) {
  event.source.postMessage(event.data, "*");
}
</script>
</head>
<body>

Frame 2-2.
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</body>
</html>