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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<textarea id='code'>let camel = 'duck'; camel</textarea>
<button onclick='handelSubmit()'>click</button>
<iframe sandbox='allow-scripts' id='targetFrame' src='iframePage.html' style="display: none;"></iframe>
<pre><code id='code-result'></code></pre>
<script>
function handelSubmit() {
let code = document.getElementById('code').value;
document.getElementById('targetFrame')
.contentWindow.postMessage(code, '*')
};
window.addEventListener('message', event => {
let codeResult = document.getElementById('code-result');
if (event.origin === "null"
|| (event.origin === (window.location.protocol + "//" + window.location.host)
&& eevent.source === unsandboxedFrame.contentWindow)) {
codeResult.innerHTML = event.data
}
});
</script>
</body>
</html>