Question

最近有一个类似的问题，但仍然无法得到它。我必须在添加新用户之前验证注册页面。

app.post('/signup', function(req, res) {
    //checking if first name is filled
    if (req.body.first_name = "" || req.body.first_name = null || req.body.first_name = undefined) {
      res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "error" : "empty_first_name" });
      break;
    }
    //checking if last name is filled
    if (req.body.last_name = "" || req.body.last_name = null || req.body.last_name = undefined) {
      res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "error" : "empty_last_name" });
      break;
    }
    //checking if email is filled
    if (req.body.email = "" || req.body.email = null || req.body.email = undefined) {
      res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "error" : "empty_email" });
      break;
    }
    //checking if passwords match
    if (req.body.password != req.body.repassword) {
      res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "error" : "pass_missmatch" });
      break;
    }
    ...
    ...
    ...
    //and finally if everything seems to be OK...
    addUser(req.body.email, req.body.password, req.body.first_name, req.body.last_name, req.body.country, function(status) {
        res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "success" : 1 });
    });
});

Node.JS告诉我所有休息都是非法的。但是我该怎样以正确的方式打破我的功能呢？它没有返回任何东西。谢谢！

Answer 1

return语句用于暂停函数。

您可以提供可选的返回值，但在这种情况下，我认为它会被忽略，因此您应该能够将break;替换为return;。

旁注，但您有一些重复的代码，并且您在if条件下进行了分配。你通常可以将重复因素排除在外。此外，如果您使用return语句，则可以完全删除if/else if/else。

这是一个例子。

function isEmpty(val) {
    return val === "" || val == null;
}

function renderWithError(req, res, msg) {
    res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "error" : msg });
}

app.post('/signup', function(req, res) {
    if (isEmpty(req.body.first_name)) {
      renderWithError(req, res, "empty_first_name");
    }
    else if (isEmpty(req.body.last_name)) {
      renderWithError(req, res, "empty_last_name");
    }
    else if (isEmpty(req.body.email)) {
      renderWithError(req, res, "empty_email");
    }
    else if (req.body.password != req.body.repassword) {
      renderWithError(req, res, "pass_missmatch");
    }
    ...
    ...
    ...
    else {
        addUser(req.body.email, req.body.password, req.body.first_name, req.body.last_name, req.body.country, function(status) {
            res.render('signup', { "title": "Ttitle", "menu": "signup", user: req.user, "success" : 1 });
        });
    }
});

NodeJS - 如何破解功能？

1 个答案: