diff --git a/img/63.png b/img/63.png
new file mode 100644
index 0000000..4d44f1c
Binary files /dev/null and b/img/63.png differ
diff --git a/zy-补环境框架/window.js b/zy-补环境框架/window.js
new file mode 100644
index 0000000..f97c7e7
--- /dev/null
+++ b/zy-补环境框架/window.js
@@ -0,0 +1,15 @@
+navigator = {
+    userAgent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36"
+};
+
+Object.getOwnPropertyDescriptor_ = Object.getOwnPropertyDescriptor;
+
+Object.getOwnPropertyDescriptor = function (o,p) {
+    if(navigator.toString() == "[object Navigator]"){
+        return undefined;
+    }
+    Object.getOwnPropertyDescriptor_.apply(this, arguments)
+};
+
+const descriptor1 = Object.getOwnPropertyDescriptor(navigator, 'userAgent');
+console.log(descriptor1);
diff --git a/zy-补环境框架/补环境2.md b/zy-补环境框架/补环境2.md
index 98dbb64..541c40d 100644
--- a/zy-补环境框架/补环境2.md
+++ b/zy-补环境框架/补环境2.md
@@ -13,4 +13,51 @@ jsdom 是许多 web 标准的纯 JavaScript 实现，特别是 WHATWG DOM和HTML
     利用谷歌开源浏览器，进行修改内核代码
     
     代码如果被检测
-    tostring，node
\ No newline at end of file
+    tostring，node，基于原型连的检测，dom环境
+    
+## 检测举例 Object.getOwnPropertyDescriptor
+
+在node中运行 Object.getOwnPropertyDescriptor
+
+    navigator = {
+        userAgent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36"
+    };
+    
+    const descriptor1 = Object.getOwnPropertyDescriptor(navigator, 'userAgent');
+    console.log(descriptor1);
+
+会出现
+
+    {
+      value: 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36',
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+    
+浏览器中运行，这里打印的 undefined
+
+![debugger](../img/63.png)
+
+接下来就需要重写 getOwnPropertyDescriptor 逻辑
+
+    navigator = {
+        userAgent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36"
+    };
+    
+    Object.getOwnPropertyDescriptor_ = Object.getOwnPropertyDescriptor;
+    
+    Object.getOwnPropertyDescriptor = function (o,p) {
+        if(navigator.toString() == "[object Navigator]"){
+            return undefined;
+        }
+        Object.getOwnPropertyDescriptor_.apply(this, arguments)
+    };
+    
+    const descriptor1 = Object.getOwnPropertyDescriptor(navigator, 'userAgent');
+    console.log(descriptor1);
+    
+## 代理是什么
+
+    js代码中读了 window.ayf 现在我需要拦截代码
+