diff --git a/ast-hook-for-js-RE b/ast-hook-for-js-RE
index 1a5f1a4..7b87ef1 160000
--- a/ast-hook-for-js-RE
+++ b/ast-hook-for-js-RE
@@ -1 +1 @@
-Subproject commit 1a5f1a4e6a76ad3f7627559d0a04af26d439fef1
+Subproject commit 7b87ef1983413bf7b3ab922efa6e6a3495f85f89
diff --git a/img/111.png b/img/111.png
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diff --git a/img/112.png b/img/112.png
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diff --git a/img/113.png b/img/113.png
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diff --git a/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/key测试.js b/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/key测试.js
new file mode 100644
index 0000000..a6d86e4
--- /dev/null
+++ b/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/key测试.js	
@@ -0,0 +1,16 @@
+function uuid() {
+    var s = [];
+    var hexDigits = "0123456789abcdefghijklmnopqrstuvwxyz";
+    for (var i = 0; i < 36; i++) {
+        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
+    }
+    s[14] = "4";
+    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);
+    s[8] = s[13] = s[18] = s[23] = "-";
+    var uuid = s.join("");
+    return uuid;
+}
+
+uuid_res = uuid();
+
+console.log(uuid_res);
\ No newline at end of file
diff --git a/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/readme1.md b/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/readme1.md
new file mode 100644
index 0000000..47bdd3b
--- /dev/null
+++ b/夜幕-第9课练习题使用代码压缩技术对Javascript 代码进行混淆/readme1.md	
@@ -0,0 +1,55 @@
+在JS逆向系列课的第9课《一击即中 处理常见代码混淆的方法》中，我们见到了5中看起来很厉害的混淆字符串，也学会了如何轻松干掉它们。 那么现在，请运用你在第9课第5节中学到的知识，尝试做一下这道题吧~
+
+请问：
+
+这一页帖子的平均阅读量（列表页右侧的数字）是多少？（需整除）
+
+找到加密的地方打断点
+
+![debugger](../img/111.png)
+
+发现加密地方
+
+    md5(key + base64.encode(time) + 'xianyucoder11')
+    
+key = "9247afed8bea110ae75461a9b54b2eeaff2b73cf"
+
+base64.encode(time) 中的 time = "16786173524"，测试发现base64没有魔改
+
+key 是如何得到的
+
+    let key = uuid();
+
+开始扣js代码
+
+    function uuid() {
+        var s = [];
+        var hexDigits = "0123456789abcdefghijklmnopqrstuvwxyz";
+        for (var i = 0; i < 36; i++) {
+            s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
+        }
+        s[14] = "4";
+        s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);
+        s[8] = s[13] = s[18] = s[23] = "-";
+        var uuid = s.join("");
+        return uuid;
+    }
+
+本地运行，可以直接运行
+
+    function uuid() {
+        var s = [];
+        var hexDigits = "0123456789abcdefghijklmnopqrstuvwxyz";
+        for (var i = 0; i < 36; i++) {
+            s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
+        }
+        s[14] = "4";
+        s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);
+        s[8] = s[13] = s[18] = s[23] = "-";
+        var uuid = s.join("");
+        return uuid;
+    }
+    
+    uuid_res = uuid();
+    
+    console.log(uuid_res);
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