NuoHui
commented
4 years ago app.use() api
/**
* Use the given middleware `fn`.
*
* Old-style middleware will be converted.
*
* @param {Function} fn
* @return {Application} self
* @api public
*/
use(fn) {
if (typeof fn !== 'function') throw new TypeError('middleware must be a function!');
if (isGeneratorFunction(fn)) {
deprecate('Support for generators will be removed in v3. ' +
'See the documentation for examples of how to convert old middleware ' +
'https://github.com/koajs/koa/blob/master/docs/migration.md');
fn = convert(fn);
}
debug('use %s', fn._name || fn.name || '-');
this.middleware.push(fn);
return this;
}
app.use(index.routes(), index.allowedMethods())这样写法route.allowedMethods()应该没有注册到koa2 中间件里面去，我本地跑demo调试, 执行option也不会进去断点。 需要改成 app.use(index.routes()).use(index.allowedMethods()) 即可。没明白之前写法的作用是什么,请指教。