vscode断点启动无效

之前调试一直好好的，前天突然有一次vscode 调试node,启动成功了，但是postman访问不了了，显示访问超时
但是在launch.json文件中的配置是

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "program": "${workspaceFolder}\\app.js"
        }
    ]
}