Node.js + Connect(Node.js + Connect)

Node.js + Connect(Node.js + Connect)

我需要一些解释。 我有app.js：

...使用（重写）.use（...）

rewrite.js：

.... module.exports = function(req, res, next) { ..... if (match) { findPostIdBySlug(match[1], function(err, id) { ..... next(); }); ....

我没有创建函数findPostIdBySlug（）我的意思是当我尝试时：

var findPostIdBySlug = function() { return;}

一切都没有。 程序只在rewrite.js中的next（）之前停止。 如何在代码中实现此函数（findPostIdBySlug）以便在没有挂起的情况下运行？ 我应该在哪里放置功能？

I need some explanations. i have app.js:

...use(rewrite) .use(...)

rewrite.js:

.... module.exports = function(req, res, next) { ..... if (match) { findPostIdBySlug(match[1], function(err, id) { ..... next(); }); ....

I did not get to create a function findPostIdBySlug() I mean when i try just:

var findPostIdBySlug = function() { return;}

nothing going on. Program just stop before next() in rewrite.js. What do I have to implement this function (findPostIdBySlug) in the code to run without hang-ups? And where should I place the function itself?

最满意答案

如果next()在匿名function体内：

findPostIdBySlug(match[1], function(err, id) { next(); });

然后， findPostIdBySlug()需要至少调用该function ：

var findPostIdBySlug = function (slug, callback) { callback(); };

这样它就可以调用next() 。

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另请注意，中间件中的所有路径都应该导致next()或响应。 包括没有match ，将不会调用findPostIdBySlug 。

if (match) { findPostIdBySlug(match[1], function(err, id) { next(); }); } else { next(); }

If next() is within the anonymous function's body:

findPostIdBySlug(match[1], function(err, id) { next(); });

Then, findPostIdBySlug() needs to at least call that function:

var findPostIdBySlug = function (slug, callback) { callback(); };

So that it can in turn call next().

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Also note that all paths in a middleware should lead to next() or a response. Including when there isn't a match and findPostIdBySlug won't be called.

if (match) { findPostIdBySlug(match[1], function(err, id) { next(); }); } else { next(); }