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backend/js_express.py

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+# -*- coding: utf-8 -*-
+"""
+JavaScript Express.js 后端项目初始化模块
+"""
+
+import subprocess
+import sys
+
+
+def run_command_with_progress(cmd, cwd, description):
+    """运行命令并显示实时输出"""
+    try:
+        print(f"\n{'=' * 60}")
+        print(f"执行: {description}")
+        print(f"{'=' * 60}")
+        
+        process = subprocess.Popen(
+            cmd,
+            cwd=cwd,
+            shell=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            bufsize=0
+        )
+        
+        for line in process.stdout:
+            try:
+                decoded_line = line.decode('utf-8', errors='replace')
+            except:
+                try:
+                    decoded_line = line.decode('gbk', errors='replace')
+                except:
+                    decoded_line = line.decode('latin-1', errors='replace')
+            print(decoded_line, end='')
+        
+        process.wait()
+        
+        if process.returncode == 0:
+            print(f"\n{'=' * 60}")
+            print(f"✅ {description} - 完成")
+            print(f"{'=' * 60}\n")
+            return True
+        else:
+            print(f"\n{'=' * 60}")
+            print(f"❌ {description} - 失败 (错误码: {process.returncode})")
+            print(f"{'=' * 60}\n")
+            return False
+            
+    except Exception as e:
+        print(f"\n❌ 执行失败: {str(e)}")
+        return False
+
+
+def init_express_project(backend_dir, project_name):
+    """初始化 Express.js 项目"""
+    print("\n🚀 初始化 Express.js 项目...")
+    
+    # 初始化 npm 项目
+    success = run_command_with_progress(
+        "npm init -y",
+        backend_dir,
+        "初始化 npm 项目"
+    )
+    
+    if not success:
+        print("\n💡 提示: 请确保已安装 Node.js 和 npm")
+        print("   下载地址: https://nodejs.org/")
+        sys.exit(1)
+    
+    # 安装依赖
+    run_command_with_progress(
+        "npm install express cors",
+        backend_dir,
+        "安装 Express.js 依赖"
+    )
+    
+    # 安装开发依赖
+    run_command_with_progress(
+        "npm install -D nodemon",
+        backend_dir,
+        "安装开发依赖 (nodemon)"
+    )
+    
+    # 创建 app.js
+    app_js = backend_dir / "app.js"
+    app_js.write_text(f'''const express = require('express');
+const cors = require('cors');
+
+const app = express();
+const PORT = 8080;
+
+// 中间件
+app.use(cors());
+app.use(express.json());
+
+// 健康检查接口
+app.get('/api/health', (req, res) => {{
+    res.json({{
+        status: 'ok',
+        message: 'Welcome to {project_name} API'
+    }});
+}});
+
+// 示例接口
+app.get('/api/hello', (req, res) => {{
+    res.json({{ message: 'Hello from Express.js!' }});
+}});
+
+// 启动服务器
+app.listen(PORT, () => {{
+    console.log('🚀 服务器启动: http://localhost:' + PORT);
+    console.log('📍 健康检查: http://localhost:' + PORT + '/api/health');
+}});
+''', encoding='utf-8')
+    
+    # 更新 package.json 添加脚本
+    package_json = backend_dir / "package.json"
+    import json
+    pkg = json.loads(package_json.read_text(encoding='utf-8'))
+    pkg['scripts'] = {
+        'start': 'node app.js',
+        'dev': 'nodemon app.js'
+    }
+    pkg['name'] = f'{project_name}-backend'
+    package_json.write_text(json.dumps(pkg, indent=2, ensure_ascii=False), encoding='utf-8')
+    
+    print("\n✅ Express.js 项目初始化成功")
+    print("💡 启动命令: npm run dev (开发模式) 或 npm start (生产模式)")