原本的接口写法

  router.get('/getSuppList', async (req, res, next) => {
        // 获取token
        const tk = String(req.headers.authorization || '').split(' ').pop();
        if (await token.checkToken(tk) === false) {
            res.send({
                code: 400,
                msg: 'token校验失败'
            })
        } else {
            next()
        }
    }, async (req, res) => {
        const data = await conn.exec('SELECT * FROM Supplier');
        if (data.length > 0) {
            res.send({
                code: 200,
                msg: '获取供应商数据成功',
                SuppList: data
            })
        } else {
            res.send({
                code: 400,
                msg: '获取供应商数据失败'
            })
        }
    })

改进后的写法 在接口入口文件处新增中间件 将接口放到token校验中间件下面

app.use(async (req, res, next) => {
    // 获取token
    const ytoken = String(req.headers.authorization || '').split(' ').pop();
    // 校验token是否过期
    if (await token.checkToken(ytoken) === false) {
        res.send({
            code: 400,
            msg: 'token过期',
            message: '请求被拦截',
            Result: false
        })
        return
    } else {
        console.log('token校验通过,已被放行');
        next()
    }
})

最终接口写法变成

    router.get('/getSuppList', async (req, res) => {
        const data = await conn.exec('SELECT * FROM Supplier');
        if (data.length > 0) {
            res.send({
                code: 200,
                msg: '获取供应商数据成功',
                SuppList: data
            })
        } else {
            res.send({
                code: 400,
                msg: '获取供应商数据失败'
            })
        }
    })