Javascript 使旧链接在express中向后兼容

您有一个在express和angular中创建的应用程序，允许用户执行搜索。URL是基于刚才执行的搜索生成的。所以如果你在“Will”上搜索url看起来像

http://localhost.com:9000/search/query?q=Will

一切正常，但您忘记了应用程序以前在没有

/query？=

的情况下执行搜索，现在您所有的旧链接，如

http://localhost.com:9000/search/will

或

http://localhost.com:9000/search/roberto

不再工作

让旧链接重新工作的正确方法是什么

---

您是否应该在前端使用JavaScript来查找/query？=URL中缺失的内容，并在搜索路径之后、查询文本之前添加？

在Express后端执行重定向会更容易

假设

/search/query

路径的代码最初是这样的：

app.get("/search/query", function (req, res) {
    // Do your query validation and fetch your search result.
    // Here, I just check if a query value was given or not for the q param.
    // I recommend you use better ways to check for empty queries. 
    // (ex: lodash's `isEmpty()` function)
    if (req.query.q) {
        // Serve the page !
        res.send("What you want to render if the search result finds something.");
    }
    else {
        // Return an error !
        res.status(404).send("Nothing was found with the criterias entered.");
    }
});

这可能与您拥有的类似。现在，根据上述初步实施情况，以下是您问题的答案：

app.get("/search/query", function (req, res, next) {
    // Check if a query value was given AND if the value isn't equal to "query".
    // The later condition is to prevent infinite loops.
    if (req.query.q && req.query.q !== "query") {
        // Redirect using the value assigned to the q query param.
        res.redirect("/search/" + req.query.q);
    }
    else {
        // Since there is no query parameter named `q` in the request,
        // we can be sure that `query` reffers to a search term.
        next();
    }
});

app.param("srchterm", function (req, res, next, value) {
    // Check, for example, if the value isn't empty.
    if (value) {
        // Do your query validation and fetch your search result HERE.
        // Add those results in an array in the res.locals object.
        // Those results can be used later.
        res.locals.results = ["all", "your", "search", "results"];
    }
    next();
});

app.get("/search/:srchterm", function (req, res) {
    console.log("another blah");
    // We don't need to fetch the data here anymore, since it's handled by the param parser above!
    // However, it's still necessary to check if the search gave back some results.
    if (res.locals.results) {
        // Serve the results !
        res.send("A total of " + res.locals.results.length + " results were found for " + req.params['srchterm']);
    }
    else {
        // Return an error !
        res.status(404).send("Nothing was found with the criterias entered.");
    }
});

---

因此，从现在起，使用

/search/query？q=123

的每个查询都将重定向到

/search/123

。它甚至允许您使用

query

作为搜索词

只需使用正则表达式并重定向即可

app.use(function(req, res, next) {
    var searchRegEx = /\/search/g;
    var searchedTerm = req.originalUrl.replace(searchRegEx, '');
    var queryPath = req.originalUrl.match(/\/query[?]q=/);
    if(!queryPath) {
        var regexSlash = /\//g;
        res.redirect('query?q=' + searchedTerm.replace(regexSlash, ''));
    }
    else {
        next();
    } 
});

---

您的解决方案无法解决此问题。重定向应该转到

/search/query？=123

，而不是指向

/search/123

，而您确实有有用的代码。我找到了解决这个问题的另一种方法。我知道，在回答了他的解决方案后，我发现情况完全相反。如果你想叫我混蛋，但我相信如果这个问题问得不那么让人困惑，我可能会回答正确；通常，您定义程序的初始状态，然后提及您试图实现的目标，而不是相反。