diff --git a/AST抽象语法树/15.AST代码还原案例/1-2020-06-09.js b/AST抽象语法树/15.AST代码还原案例/1-2020-06-09.js
new file mode 100644
index 0000000..ccc4fc3
--- /dev/null
+++ b/AST抽象语法树/15.AST代码还原案例/1-2020-06-09.js
@@ -0,0 +1,27 @@
+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+const types = require('@babel/types');
+let encode_file = "./1-encode-2020-06-09.js";
+
+let js_code = fs.readFileSync(encode_file, {encoding: "utf-8"});
+let ast = parse(js_code, {
+    sourceType: 'module',
+});
+
+const visitor = {
+    CallExpression: {
+        enter(path) {
+            let {node} = path
+            let arguments = node.arguments
+            if (arguments[1].value != 'Hello AST'){
+                path.remove()
+            }
+        }
+    }
+}
+
+traverse(ast, visitor);
+let {code} = generator(ast);
+console.log(code)
\ No newline at end of file
diff --git a/AST抽象语法树/15.AST代码还原案例/1-encode-2020-06-09.js b/AST抽象语法树/15.AST代码还原案例/1-encode-2020-06-09.js
new file mode 100644
index 0000000..4094715
--- /dev/null
+++ b/AST抽象语法树/15.AST代码还原案例/1-encode-2020-06-09.js
@@ -0,0 +1,12 @@
+var s = {
+    'hello': function(_0x4c52de) {
+        (function(_0xea7649, _0x55a64b) {
+                return function(_0x46f67a, _0x29dec9) {
+                    return function(_0x56ee68, _0x1607ce) {
+                        return _0x56ee68(_0x1607ce);
+                    }(_0x46f67a, _0x29dec9);
+                }(_0xea7649, _0x55a64b);
+            }
+        )(alert, "Hello AST");
+    },
+}