console
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=, initial-scale=">
<meta http-equiv="X-UA-Compatible" content="">
<title></title>
</head>
<body>
<h1>父页面</h1>
<iframe id="receiver" src="http://192.168.250.1:8080/">
<p>您的浏览器不支持</p>
</iframe>
<script>
window.onload = function() {
var receiver = document.getElementById('receiver').contentWindow;
console.log(receiver, 111);
var btn = document.getElementById('sendMessage');
btn.addEventListener('click', function (e) {
e.preventDefault();
var val = document.getElementById('text').value;
receiver.postMessage("Hello "+val+"！", "http://192.168.250.1:8080");
});
}
</script>
</body>
</html>