From e6a72aae2731e0beb4f368c52e31aa0df0d2a4ea Mon Sep 17 00:00:00 2001
From: aiyingfeng <aiyingfeng110@qq.com>
Date: Mon, 17 Jul 2023 20:51:53 +0800
Subject: [PATCH] =?UTF-8?q?AST=E6=93=8D=E4=BD=9C=E4=B9=8BAPI=E7=94=A8?=
 =?UTF-8?q?=E6=B3=95-path=E8=B7=AF=E5=BE=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../5.AST操作之API用法-path路径/README.md     | 39 +++++++++++++++++++
 .../decode_obfuscator.js                      |  4 +-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/AST抽象语法树/5.AST操作之API用法-path路径/README.md b/AST抽象语法树/5.AST操作之API用法-path路径/README.md
index 704a01b..0428db1 100644
--- a/AST抽象语法树/5.AST操作之API用法-path路径/README.md
+++ b/AST抽象语法树/5.AST操作之API用法-path路径/README.md
@@ -227,3 +227,42 @@ var a;
 ```
 
 **替换path，单路径可以使用`replaceWith`方法，多路径则使用`replaceWithMultiple`方法**
+
+需求：把var a = 123; 修改成var a =  3 ，用replaceWith方法
+
+```javascript
+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+let encode_file = "./encode.js";
+
+let js_code = fs.readFileSync(encode_file, {encoding: "utf-8"});
+let ast = parse(js_code, {
+    sourceType: 'module',
+});
+
+const visitor = {
+    enter(path) {
+        if (path.isNumericLiteral() && path.node.value == 123) {
+            path.replaceWith({type: "NumericLiteral", value: 3});
+        }
+    },
+}
+
+traverse(ast, visitor);
+
+// 写入文件
+let {code} = generator(ast);
+console.log(code)
+fs.writeFile('decode.js', code, (err) => {
+});
+```
+
+打印内容：
+
+```javascript
+var a = 3;
+```
+
+注意点，必须加上`&& path.node.value == 123`判断，否则就是无限循环
\ No newline at end of file
diff --git a/AST抽象语法树/5.AST操作之API用法-path路径/decode_obfuscator.js b/AST抽象语法树/5.AST操作之API用法-path路径/decode_obfuscator.js
index 08e1824..f9f890e 100644
--- a/AST抽象语法树/5.AST操作之API用法-path路径/decode_obfuscator.js
+++ b/AST抽象语法树/5.AST操作之API用法-path路径/decode_obfuscator.js
@@ -11,8 +11,8 @@ let ast = parse(js_code, {
 
 const visitor = {
     enter(path) {
-        if (path.isNumericLiteral()) {
-            path.replaceWith({type:"NumericLiteral",value:3});
+        if (path.isNumericLiteral() && path.node.value == 123) {
+            path.replaceWith({type: "NumericLiteral", value: 3});
         }
     },
 }