你可以写一个函数来检测一个条件，像这样：

function maybe(fn) {
    return function(req, res, next) {
        if (req.path === '/posts/add' && req.method === 'POST') {
            next();
        } else {
            fn(req, res, next);
        }
    }
}

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然后修改app.use语句：

app.use(maybe(express.bodyParser()));

型

在typescript中，你可以这样写一个except函数：

import { Request, Response, NextFunction, } from 'express';
type MiddlewareFn = (req: Request, res: Response, next: NextFunction) => void;

export const middlewareExcept =
    (fn: MiddlewareFn, except: string[]): MiddlewareFn =>
    (req, res, next) => {
        if (except.includes(req.path)) next();
        else fn(req, res, next);
    };

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