错误类型错误： 无法读取未定义的属性"加载子项"

Question

我刚刚添加了一些模块+路由+AuthGuard来重定向到那些(登录(页面。

一切似乎都正常(我可以导航到它们，页面之间的链接正常，AuthGuard正确重定向(，但我在chrome日志中得到了这个错误：

core.js:4197 ERROR TypeError: Cannot read property 'loadChildren' of undefined
at RouterPreloader.processRoutes (router.js:5220)
at RouterPreloader.processRoutes (router.js:5222)
at RouterPreloader.preload (router.js:5208)
at MergeMapSubscriber.project (router.js:5203)
at MergeMapSubscriber._tryNext (mergeMap.js:46)
at MergeMapSubscriber._next (mergeMap.js:36)
at MergeMapSubscriber.next (Subscriber.js:49)
at FilterSubscriber._next (filter.js:33)
at FilterSubscriber.next (Subscriber.js:49)
at Subject.next (Subject.js:39)

我使用的是angular 10.0.14，不确定是什么导致了这个问题？

只有当我进入其中一个新页面时，问题才会出现。

这是我的身份验证模块：

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { LoginComponent } from './login/login.component';
import { AuthRoutingModule } from './auth-routing.module';
import { LostPasswordComponent } from './lost-password/lost-password.component';
import { SignupComponent } from './signup/signup.component';

@NgModule({
declarations: [LoginComponent, SignupComponent, LostPasswordComponent, SignupComponent],
imports: [
CommonModule,
AuthRoutingModule
]
})
export class AuthModule { }

这是AuthRoutingModule：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { LoginComponent } from './login/login.component';
import { LostPasswordComponent } from './lost-password/lost-password.component';
import { SignupComponent } from './signup/signup.component';
const routes: Routes = [
{
path: '',
redirectTo: 'signin',
pathMatch: 'full',
},
{
path: 'signin',
component: LoginComponent,
},
{
path: 'signup',
component: SignupComponent,
},
,
{
path: 'lost-password',
component: LostPasswordComponent,
},
];
@NgModule({
imports: [RouterModule.forChild(routes)],
exports: [RouterModule],
})
export class AuthRoutingModule {}

这些页面只是彼此之间有链接的空页面，比如：

<p>login works!</p>
<a [routerLink]="['/auth/signup']" routerLinkActive="router-link-active" >Sign up instead</a>
<a [routerLink]="['/auth/lost-password']" routerLinkActive="router-link-active" >Password lost?</a>

如果我进入其他模块的某个页面，没有错误。

AppRouting模块：

import { NgModule } from '@angular/core';
import { PreloadAllModules, RouterModule, Routes } from '@angular/router';
import { AuthGuard } from './auth/auth.guard';
const routes: Routes = [
{
path: '',
redirectTo: 'folder/Inbox',
pathMatch: 'full',
},
{
path: 'folder/:id',
loadChildren: () => import('./folder/folder.module').then((m) => m.FolderPageModule),
canActivate: [AuthGuard],
},
{
path: 'auth',
loadChildren: () => import('./auth/auth.module').then((m) => m.AuthModule),
},
];
@NgModule({
imports: [RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })],
exports: [RouterModule],
})
export class AppRoutingModule {}

知道问题出在哪里吗？或者如何修复？

Answer 1

实际上，错误是AuthRoutingModule中的一个额外逗号。删除此项可能会修复此错误。

{
path: 'signup',
component: SignupComponent,
},
,

Answer 2

您可以尝试导出AuthRoutingModule:

@NgModule({
declarations: [LoginComponent, SignupComponent, LostPasswordComponent, SignupComponent],
imports: [
CommonModule,
AuthRoutingModule
],
export: [AuthRoutingModule]
})
export class AuthModule { }

Answer 3

在我们的例子中，我们只需要添加aot选项(我们的项目有点过时(：

{
...
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"aot": true,
...

我们新添加了一些语法，aot选项在构建阶段会有所帮助。将语法改为传统方式也解决了这个问题