在运行时删除Node.js中的特定映射路由会删除静态映射？ [英] Removing a specfic mapped route in Node.js at runtime removes static mapping?

问题描述

根据这个问题的回答我的功能，我写了这个功能来删除一个直播站点上的一条路线（使用Express和Node）。

Basing my function off of the answer to this question, I wrote this function to delete a route on a live site (using Express and Node).

function deleteRoute(url) {


 for (var i = app.routes.get.length - 1; i >= 0; i--) {
   if (app.routes.get[i].path === "/" + url) {
     console.log(app.routes.get[i]);
     delete app.routes.get[i];
     console.log(app.routes.get)
   }
 }
}

但是，当我运行它时，似乎删除了所有静态页面的路由，这些页面在启动时被声明为：

However, when I run this it also seems to delete the routing to all of my static pages, which are declared at startup like this:

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

我一直在摔跤一段时间，似乎没有抓住它。有人可以帮忙吗？每当我在之前和之后登录app.routes.get时，看起来操作都是正确的。

I've been wrestling this for a while and can't seem to get a grip on it. Can anyone out there help? Whenever I log app.routes.get before and after, it looks like the operation is done correctly.

具体来说，这是在重新加载任何静态页面后收到的错误路由被删除：

Specifically, this is the error I get when reloading any static page after the route is removed:

 TypeError: Cannot call method 'match' of undefined

这是删除之前的app.routes：

Here is app.routes before the deletion:

 { get: 
  [ { path: '/',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/\/?$/i,
   params: [] },
 { path: '/index.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/index\.html\/?$/i,
   params: [] },
 { path: '/how_it_works.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/how_it_works\.html\/?$/i,
   params: [] },
 { path: '/about.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/about\.html\/?$/i,
   params: [] },
 { path: '/contribute.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contribute\.html\/?$/i,
   params: [] },
 { path: '/contact.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contact\.html\/?$/i,
   params: [] },
 { path: '/a.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/a\.html\/?$/i,
   params: [] } ],
post: 
 [ { path: '/admin-save.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/admin-save\.json\/?$/i,
   params: [] },
 { path: '/page-edit.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/page-edit\.json\/?$/i,
   params: [] },
 { path: '/get-pages.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/get-pages\.json\/?$/i,
   params: [] },
 { path: '/admin-delete.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/admin-delete\.json\/?$/i,
   params: [] } ] }

以下是：

{ get: 
 [ { path: '/',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/\/?$/i,
   params: [] },
 { path: '/index.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/index\.html\/?$/i,
   params: [] },
 { path: '/how_it_works.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/how_it_works\.html\/?$/i,
   params: [] },
 { path: '/about.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/about\.html\/?$/i,
   params: [] },
 { path: '/contribute.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contribute\.html\/?$/i,
   params: [] },
 { path: '/contact.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contact\.html\/?$/i,
   params: [] },
  ],
 post: 
  [ { path: '/admin-save.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/admin-save\.json\/?$/i,
   params: [] },
 { path: '/page-edit.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/page-edit\.json\/?$/i,
   params: [] },
 { path: '/get-pages.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/get-pages\.json\/?$/i,
   params: [] },
 { path: '/admin-delete.json',
   method: 'post',
   callbacks: [Object],
   keys: [],
   regexp: /^\/admin-delete\.json\/?$/i,
   params: [] } ] }

推荐答案

删除用于从对象中删除密钥，而不是从数组中删除条目。通过调用 delete ，您实际上将该数组位置的值设置为 undefined ，因此Express仍将尝试处理

delete is for removing keys from objects, not for removing entries from arrays. By calling delete, you are essentially setting the value of that array location to undefined, so Express will still try to process that route when it looks through the routes.

请注意您的输入：

 { path: '/contact.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contact\.html\/?$/i,
   params: [] },
 { path: '/a.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/a\.html\/?$/i,
   params: [] } ],

vs after：

 { path: '/contact.html',
   method: 'get',
   callbacks: [Object],
   keys: [],
   regexp: /^\/contact\.html\/?$/i,
   params: [] },
  ],

您删除了a.html路径，但请注意，仍然有一个，之后的 contact.html 对象。这是因为数组条目仍然存在，它只是没有价值。

You erased the 'a.html' path, but note that there is still a , after the contact.html object. That is because the array entry is still there, it just has no value.

您需要使用 splice 删除条目。

function deleteRoute(url) {
  for (var i = app.routes.get.length - 1; i >= 0; i--) {
    if (app.routes.get[i].path === "/" + url) {
      app.routes.get.splice(i, 1);
    }
  }
}

还指出了这种方法在你的问题链接的问题的第二个答案。

This method is also pointed out in the second answer of the question you linked to in your question.

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