这是另一种解决方案:您可以使用函数组合将多个处理程序组合成一个处理程序。req.url
如果不匹配,每个处理程序都应该将执行交给下一个处理程序。wrapHandler
也可以进一步扩展以考虑 HTTP 方法。
var http = require('http');
var handler1 = function(req, res) {
res.writeHead(200, { 'Content-Type': 'text/html' });
res.write('/');
res.end();
}
var handler2 = function(req, res) {
res.writeHead(200, { 'Content-Type': 'text/html' });
res.write('/Hello');
res.end();
}
var middleware = compose([wrapHandler('/', handler1),
wrapHandler('/hello', handler2)]);
http.createServer(middleware).listen(3000);
function wrapHandler(path, cb) {
return function (req, res, next) {
if (req.url === path) {
cb(req, res);
} else {
next();
}
};
}
function notFoundHandler(req, res) {
res.writeHead(404, { 'Content-Type': 'text/html' });
res.write('No Path found');
res.end();
};
// adapted from koa-compose
function compose(middleware) {
return function (req, res){
let next = function () {
notFoundHandler.call(this, req, res);
};
let i = middleware.length;
while (i--) {
let thisMiddleware = middleware[i];
let nextMiddleware = next;
next = function () {
thisMiddleware.call(this, req, res, nextMiddleware);
}
}
return next();
}
}