404页面应该在调用app.listen.Express支持路由路径中的*之前设置。这是一个匹配的特殊字符 任何东西。这可以用来创建一个匹配所有请求的路由处理程序。

app.get('*', (req, res) => {
  res.render('404', {
    title: '404',
    name: 'test',
    errorMessage: 'Page not found.'
  })
})

我认为你应该首先定义你所有的路线，然后作为最后的路线添加

//The 404 Route (ALWAYS Keep this as the last route)
app.get('*', function(req, res){
  res.status(404).send('what???');
});

一个示例应用程序的工作:

app.js:

var express = require('express'),
    app = express.createServer();

app.use(express.static(__dirname + '/public'));

app.get('/', function(req, res){
  res.send('hello world');
});

//The 404 Route (ALWAYS Keep this as the last route)
app.get('*', function(req, res){
  res.send('what???', 404);
});

app.listen(3000, '127.0.0.1');

alfred@alfred-laptop:~/node/stackoverflow/6528876$ mkdir public
alfred@alfred-laptop:~/node/stackoverflow/6528876$ find .
alfred@alfred-laptop:~/node/stackoverflow/6528876$ echo "I don't find a function for that... Anyone knows?" > public/README.txt
alfred@alfred-laptop:~/node/stackoverflow/6528876$ cat public/README.txt 

.
./app.js
./public
./public/README.txt

alfred@alfred-laptop:~/node/stackoverflow/6528876$ curl http://localhost:3000/
hello world
alfred@alfred-laptop:~/node/stackoverflow/6528876$ curl http://localhost:3000/README.txt
I don't find a function for that... Anyone knows?

虽然上面的答案是正确的，但对于那些希望在IISNODE中工作的人来说，还需要指定

<configuration>
    <system.webServer>
        <httpErrors existingResponse="PassThrough"/>
    </system.webServer>
<configuration>

在你的网里。配置(否则IIS将吃掉您的输出)。

如果你想从你的函数(路由)重定向到错误页面，那么做以下事情-

Add general error messages code in your app.js - app.use(function(err, req, res, next) { // set locals, only providing error in development res.locals.message = err.message res.locals.error = req.app.get('env') === 'development' ? err : {} // render the error page // you can also serve different error pages // for example sake, I am just responding with simple error messages res.status(err.status || 500) if(err.status === 403){ return res.send('Action forbidden!'); } if(err.status === 404){ return res.send('Page not found!'); } // when status is 500, error handler if(err.status === 500) { return res.send('Server error occured!'); } res.render('error') }) In your function, instead of using a error-page redirect you can use set the error status first and then use next() for the code flow to go through above code - if(FOUND){ ... }else{ // redirecting to general error page // any error code can be used (provided you have handled its error response) res.status(404) // calling next() will make the control to go call the step 1. error code // it will return the error response according to the error code given (provided you have handled its error response) next() }

在Express中，404响应不是错误的结果，因此错误处理程序中间件不会捕获它们。你所需要做的就是在堆栈的最底部(所有其他函数的下面)添加一个中间件函数来处理404响应:

app.use(function (req, res, next) {
// YOU CAN CREATE A CUSTOM EJS FILE TO SHOW CUSTOM ERROR MESSAGE
  res.status(404).render("404.ejs")
})

发送到自定义页面:

app.get('*', function(req, res){
  if (req.accepts('html')) {
     res.send('404', '<script>location.href = "/the-404-page.html";</script>');
     return;
  }
});