node.js 快递路线参数条件
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Express routes parameter conditions
提问by danmactough
I have a route on my Express app that looks like this:
我的 Express 应用程序上有一条路线，如下所示：
app.get('/:id', function (request, response) {
…
});
The ID will always be a number. However, at the moment this route is matching other things, such as /login.
ID 将始终是一个数字。但是，目前这条路线正在匹配其他东西，例如/login.
I think I want two things from this:
我想我想从中得到两件事：
- to only use this route if the ID is a number, and
- only if there isn't a route for that specific paramater already defined (such as the clash with
/login).
- 如果 ID 是数字，则仅使用此路由，并且
- 仅当尚未定义该特定参数的路由时（例如与 发生冲突
/login）。
Can this be done?
这能做到吗？
回答by danmactough
Expanding on Marius's answer, you can provide the regex AND the parameter name:
扩展 Marius 的答案，您可以提供正则表达式和参数名称：
app.get('/:id(\d+)/', function (req, res){
// req.params.id is now defined here for you
});
回答by Marius Kjeldahl
Yes, check out http://expressjs.com/guide/routing.htmland https://www.npmjs.com/package/path-to-regexp(which express uses). An untested version that may work is:
是的，请查看http://expressjs.com/guide/routing.html和https://www.npmjs.com/package/path-to-regexp（express使用）。可能有效的未经测试的版本是：
app.get(/^(\d+)$/, function (request, response) {
var id = request.params[0];
...
});
回答by Marco Godínez
You can use:
您可以使用：
// /12345
app.get(/\/([^\/]+)\/?/, function(req, res){
var id = req.params[0];
// do something
});
or this:
或这个：
// /post/12345
app.get(/\/post\/([^\/]+)\/?/, function(req, res){
var id = req.params[0];
// do something
});
