"未捕获的类型错误:使用 EasyXDM 发送跨域消息时无法读取未定义的属性'postMessage' 错误



我正在努力使两个网站之间的数据交换系统在他们的客户端。为此,我使用EasyXDM。(http://easyxdm.net/)。这是我的父网站代码:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>EasyXDM Test</title>
    <script type="text/javascript" src="easyXDM.debug.js"></script>
    <script type="text/javascript">
        var serv_socket = new easyXDM.Socket({
            remote: "http://localhost:39452/EasyXDM/Default.aspx",
            onMessage: function (message, origin) {
                document.getElementById('msg').innerText="Received '" + message + "' from '" + origin + "'";
            },
            onReady: function () {
                serv_socket.postMessage("ID");
            }
        });
    </script>
</head>
<body>
    <form id="form1">
    <div>
    <iframe src="http://localhost:39452/EasyXDM/Default.aspx"></iframe>
        <input type="text" id="msgtext" /><a href="#" onclick="serv_socket.postMessage('d')">Send message</a>
        <div id="msg"></div>
    </div>
    </form>
</body>
</html>

下面是位于localhost:39452域名的子网站代码:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Server</title>
</head>
<body>
    <form id="form1">
        <input type="text" id="msgtext" />
        <div>
            <script type="text/javascript" src="easyXDM.debug.js"></script>
            <script type="text/javascript">
                var socket = new easyXDM.Socket({
                    onMessage: function (message, origin) {
                        //document.getElementById('msg').innerText="Received '" + message + "' from '" + origin + "'";
                        socket.postMessage(message);
                    },
                    onReady: function (msg) {
                        socket.postMessage(msg);
                    }
                });
                function send() {
                    socket.postMessage('this is message from server');
                }
            </script>
            <a href="#" id="sender" onclick="send()">Send message</a>
        </div>
    </form>
</body>
</html>

问题是,当我在儿童网站上点击Send message并调用socket.postMessage()时,它说Uncaught TypeError: Cannot read property 'postMessage' of undefined.。请告诉我如何解决这个问题?

Update: socket变为null或undefined .

我终于找到了解决方案:https://stackoverflow.com/a/13122604/1576363。我从父端删除了iframe,并将套接字的container属性添加到divid中,它起作用了。这样做的原因是EasyXDM代码会自动将iframe添加到文档中。如果您添加iframe与URL的孩子,你会得到这个错误。从链接的答案中,有一个清晰的解释:

"消费者"是父文档,EasyXDM加载"provider"是子iframe。

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