Update 9.lodash.md

Author: zhoubichuan

src/base/example/9.lodash.md

@@ -8,4 +8,80 @@ meta:
     content: vuepress,最新技术文档,vuepress语法,markdown语法
 ---
 
-# redis 增删改查
+# 检查前端项目和node项目中未被使用的依赖包
+
+```js
+import fs from 'fs'
+import path from 'path'
+const projectDir = path.resolve("."); // 当前项目目录
+const excludeDirs = ["node_modules", ".git"]; // 应该排除的目录
+
+// 读取并解析package.json
+function readPackageJson() {
+    const packageJsonPath = path.join(projectDir, "package.json");
+    if (!fs.existsSync(packageJsonPath)) {
+        console.error("package.json not found.");
+        process.exit(1);
+    }
+    return JSON.parse(fs.readFileSync(packageJsonPath, "utf8"));
+}
+
+// 递归遍历目录获取所有文件路径
+function getAllFiles(dirPath, arrayOfFiles) {
+    const files = fs.readdirSync(dirPath);
+
+    arrayOfFiles = arrayOfFiles || [];
+
+    files.forEach(function (file) {
+        if (fs.statSync(dirPath + "/" + file).isDirectory()) {
+            if (!excludeDirs.includes(file)) {
+                arrayOfFiles = getAllFiles(dirPath + "/" + file, arrayOfFiles);
+            }
+        } else {
+            arrayOfFiles.push(path.join(dirPath, "/", file));
+        }
+    });
+
+    return arrayOfFiles;
+}
+
+// 检查依赖是否在文件中被引用，包括动态引用
+function isDependencyUsed(files, dependency) {
+    const regexStaticImport = new RegExp(
+        `require\\(['"\`]${dependency}['"\`]|from ['"\`]${dependency}['"\`]`,
+        "i"
+    );
+    const regexDynamicImport = new RegExp(
+        `import\\(['"\`]${dependency}['"\`]\\)`,
+        "i"
+    );
+    return files.some((file) => {
+        const fileContent = fs.readFileSync(file, "utf8");
+        return (
+            regexStaticImport.test(fileContent) ||
+            regexDynamicImport.test(fileContent)
+        );
+    });
+}
+
+function findUnusedDependencies() {
+    const { dependencies } = readPackageJson();
+    const allFiles = getAllFiles(projectDir);
+    const unusedDependencies = [];
+
+    Object.keys(dependencies).forEach((dependency) => {
+        if (!isDependencyUsed(allFiles, dependency)) {
+            unusedDependencies.push(dependency);
+        }
+    });
+
+    return unusedDependencies;
+}
+
+const unusedDependencies = findUnusedDependencies();
+if (unusedDependencies.length > 0) {
+    console.log("未使用的依赖:", unusedDependencies.join(", "));
+} else {
+    console.log("所有依赖都已使用。");
+}
+```