From 63424936d07382a027102d5616d6029b0d9f3bed Mon Sep 17 00:00:00 2001
From: Haifeng Luo <lhf@mail.bnu.edu.cn>
Date: Sun, 30 May 2021 20:16:52 +0800
Subject: [PATCH] Add iframe example.

---
 bebras/iframeExample.html | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 bebras/iframeExample.html

diff --git a/bebras/iframeExample.html b/bebras/iframeExample.html
new file mode 100644
index 0000000..a141433
--- /dev/null
+++ b/bebras/iframeExample.html
@@ -0,0 +1,24 @@
+
+<script>
+    function showAnswer1() {
+      const data = "111";
+      const text = document.getElementById("text");
+      text.innerText = data;
+      parent.postMessage(data, "*");
+    }
+
+    function showAnswer2() {
+      const data = "222";
+      const text = document.getElementById("text");
+      text.innerText = data;
+      parent.postMessage(data, "*");
+    }
+</script>
+
+<div>
+    Answer:
+    <div id="text">Null</div>
+</div>
+
+<input type="radio" name="single" value="111" onclick="showAnswer1()">111</input>
+<input type="radio" name="single" value="222" onclick="showAnswer2()">222</input>