node.js – Expressjs req.params undefined但定义了req.req.params

router.get('/observe/:fileName', function(res, req){

    var reqFileName = req.params.fileName;

    console.log("GET /observe/" + reqFileName);
    res.end();

}

问题是,如果我在localhost / observe / myFile上执行GET请求,则变量reqFileName未定义,因为req.params.fileName未定义.但是检查(使用node-inspector)req我可以看到req有一个名为req的属性,它有params.所以req.req.params.fileName将给出我的参数值.这是正常的吗？

router.get('/observe/:fileName', function(req, res){

    var reqFileName = req.params.fileName;

    console.log("GET /observe/" + reqFileName);
    res.end();

}