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iframe 子元素和父窗口，通过postMessage实现通信
通过调用postMessage向父节点抽取
通过调用postMessage来获取result数据
参考资料
- https://robertnyman.com/html5/postMessage/postMessage.html
- http://www.cnblogs.com/dolphinX/p/3464056.html
- https://social.msdn.microsoft.com/Forums/en-US/23efd8a3-a377-4060-9e85-48596a514f12/sending-message-from-iframe-to-main-window?forum=winappswithhtml5
- https://stackoverflow.com/questions/8822907/html5-cross-browser-iframe-postmessage-child-to-parent
