这是api.js文件
function apiKey(res, req, next) {
const api_key = '12345678';
console.log(req.query);
next();
}
module.exports = apiKey;
您命名错误。应该像这个
function apiKey(req, res, next) {
const api_key = '12345678';
console.log(req.query);
next();
}
module.exports=apiKey;