建议精简此代码段？

Question

当 request.params.name 字段通过请求进入时，我希望对象的 .name 值与 pic: 一起呈现，这样我们就可以用正确的图片呈现网页。

我尝试过切片来获取 person.bros.whateverthenameis，但是当 json 对象被传递给 express 的渲染方法时，它无法正确读取。因此，与其传递 willis_pic、Llama_pic、Carter_pic（它们只是 person.burns.whateverthenameis）等 id，不如传递 person.burns.(req.params.name) 但它不能正常工作，因为 req.params.name是一个字符串，不被识别为我想要的点符号。为了清楚起见，我想以更简洁的方式将 person.burns.Willis 或 person.burns.Llama 等传递到 render 方法的 pic:param 中，因为所有这些 if 语句都是废话。我也使用了 json parse 和 stringify，当我尝试将它们记录到控制台时，它们都不起作用并且输出未定义。

router.get("/profile/:name", mid.requiresLogin, function(req,res,next) {

    var persons = {
        bros: {
            Willis: src = 'https://www.coloradocollege.edu/academics/dept/filmandnewmedia/images/Students/2018-19/Major%20Photo%20Border_WillisZetter_2019.jpg',
            Llama: src = 'https://media.licdn.com/dms/image/C5603AQFQwEfmSpR1bQ/profile-displayphoto-shrink_200_200/0?e=1568851200&v=beta&t=lX01L9YxKGJmgkGT0FwQdN1o2-oNyxA18c42q_IPcfU',
            Carter: src = 'https://cctigers.com/images/2019/2/8/Richardson2019.jpg',
            Quang: src='https://media.licdn.com/dms/image/C5103AQE3RFIlv9FMEw/profile-displayphoto-shrink_800_800/0?e=1568851200&v=beta&t=yL9fgzubo7_XZpgmbFVRwDYUYULiGVPAf091qzq5Rm8',
            Maslow: src='https://media.licdn.com/dms/image/C4E03AQHHMv2-Fo0ppg/profile-displayphoto-shrink_800_800/0?e=1568851200&v=beta&t=5KYt7vrP-iXkgy0s2eDtLvDgnge0IF2DoSELDOnm4Gg',
                Beem: src='https://media.licdn.com/dms/image/C5603AQG1_8PHv_WGoQ/profile-displayphoto-shrink_800_800/0?e=1568851200&v=beta&t=NnVjW5UjQeXG8e0QwhsKe4XvFcU8JUbgHd7d5TRSww8'

        }
    };
    //if the obj.name is === (Any of the names that are pic variables) render that persons prof
    User.findOne({name: req.params.name}, function (err, obj) {
        if (req.params.name === "Willis"){
            var pic = (JSON.stringify(persons.bros.Willis));
            var willis_pic = JSON.parse(pic);
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: willis_pic}) <--- want to get rid of this so we can insert the req.params.name variable but it won't work properly when trying to access the json obj.
        }
        else if(req.params.name === "Llama"){

            var pic = (JSON.stringify(persons.bros.Llama));
            var llama_pic = JSON.parse(pic);d
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: llama_pic})
        }
        else if (req.params.name === "Carter"){
            var pic = (JSON.stringify(persons.bros.Carter));
            var carter_pic = JSON.parse(pic);
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: carter_pic})

        }
        else if (req.params.name === "Quang"){
            var pic = (JSON.stringify(persons.bros.Quang));
            var quang_pic = JSON.parse(pic);
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: quang_pic})
        }
        else if (req.params.name === "Maslow"){
            var pic = (JSON.stringify(persons.bros.Maslow));
            var maslow_pic = JSON.parse(pic);
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: maslow_pic})
        }
        else if (req.params.name === "Beem"){
            var pic = (JSON.stringify(persons.bros.Beem));
            var beem_pic = JSON.parse(pic);
            return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: beem_pic})
        }

Answer 1

只需查找bros 对象上的req.params.name 属性，如果该属性存在，则渲染它。记住也不要忽略错误 - err 通常是提示您首先检查它的第一个参数：

const name = req.params.name;
User.findOne({ name }, function (err, obj) {
  if (err) {
    // make sure to handle errors, don't just ignore them
    // res.render... "there was an error"
    return;
  }
  const pic = persons.bros[name];
  if (!pic) {
    // handle case where the name is not in the object, if this is a possibility
    return;
  }
  return res.render('profile', {title: 'Sign Up', name, from: obj.burns, pic });
});

Answer 2

试试这个

 User.findOne({name: req.params.name}, function (err, obj) {
    if ["Willis","Llama","Carter","Quang","Maslow","Beem"].includes(req.params.name){
        var pic = (JSON.stringify(persons.bros[req.params.name]));
        var tmp_pic = JSON.parse(pic);
        return res.render('profile', {title: 'Sign Up', name: req.params.name, from: obj.burns, pic: tmp_pic})
    }
}