javascript - Angular 4 Material 项目未编译

Question

我是 Angular 新手。我已经为 Angular 项目进行了设置。第一次当我触发 ngserve --open 命令时，它打开了 url 并且工作正常。之后，我安装了 Angular Material 。现在，如果我运行该应用程序，它将带我进入新的浏览器选项卡。但显示编译错误。有人可以帮我解决确切的问题吗？过去三个小时我一直在尝试。请帮忙。

npm install --save @angular/material @angular/cdk
npm install --save @angular/animations
npm install --save hammerjs npm install --save @angular/flex-layout@latest

我的app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MaterialModule } from '@angular/material'; 
import { FlexLayoutModule } from '@angular/flex-layout';

import { AppComponent } from './app.component';
import 'hammerjs';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    MaterialModule,
    FlexLayoutModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

我的 package.json

{
  "name": "con-fusion",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.4.3",
    "@angular/cdk": "^2.0.0-beta.11",
    "@angular/common": "^4.2.4",
    "@angular/compiler": "^4.2.4",
    "@angular/core": "^4.2.4",
    "@angular/flex-layout": "^2.0.0-beta.9",
    "@angular/forms": "^4.2.4",
    "@angular/http": "^4.2.4",
    "@angular/material": "^2.0.0-beta.11",
    "@angular/platform-browser": "^4.2.4",
    "@angular/platform-browser-dynamic": "^4.2.4",
    "@angular/router": "^4.2.4",
    "core-js": "^2.4.1",
    "hammerjs": "^2.0.8",
    "rxjs": "^5.4.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "1.4.3",
    "@angular/compiler-cli": "^4.2.4",
    "@angular/language-service": "^4.2.4",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "~3.1.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.3.2",
    "typescript": "~2.3.3"
  }
}

我的app.component.html

<div style="text-align:center">
  <h1>
    Welcome to {{title}}!
  </h1>
  <img width="300" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg==">

  <md-toolbar color="primary"> <span>Ristorante Con Fusion</span> </md-toolbar>
  </div>
<h2>Here are some links to help you start: </h2>
<ul>
  <li>
    <h2><a target="_blank" rel="noopener" href="https://angular.io/tutorial">Tour of Heroes</a></h2>
  </li>
  <li>
    <h2><a target="_blank" rel="noopener" href="https://github.com/angular/angular-cli/wiki">CLI Documentation</a></h2>
  </li>
  <li>
    <h2><a target="_blank" rel="noopener" href="https://blog.angular.io/">Angular blog</a></h2>
  </li>
</ul>

我的 style.scss

@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';


body { 
  padding: 0; 
  margin: 0; 
  font-family: Roboto, sans-serif; 

}

Answer 1

参见Getting Started With Angular Material 2(September 4, 2017)

3. Custom Material Module

Prior to Angular Material 2 Beta 3, there was a global MaterialModule that could be imported in the app module to make the components available. The downside to that is that tree-shaking is not efficient enough to remove all the unused code.

MaterialModule has therefore been deprecated in favor of defining a project-specific custom material module where you import and export only the needed components. Here’s what our module can look like:

不幸的是，官方指南并不像上面的文章那么明确。您需要检查使用的每个组件并为其导入模块，然后将其添加到 AppModule 的导入部分。

看起来您只是在使用 Toolbar，因此您需要的唯一模块是 MdToolbarModule。

import { MdToolbarModule } from '@angular/material';

@NgModule({
  imports: [
    ...
    MdToolbarModule,
  ],

本质上，正如上面的文章所解释的，您“滚动自己的”MaterialModule。主要目的似乎是避免在应用程序中部署未使用的 Material 组件。