我是 Angular 2 的新手，并尝试按照我找到的视频教程进行操作。尽管遵循了所有步骤，Angular 还是无法工作；我收到以下错误：
compiler.umd.js:13854 Uncaught Error: No NgModule metadata found for 'App'.
并且该组件根本不加载。
这是我的文件：
包.json：
{
"name": "retain",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "webpack --config webpack.spec.ts --progress --color && karma start",
"start": "webpack-dev-server --inline --colors --progress --display-error-details --display-cached --port 3000 --content-base src"
},
"author": "",
"license": "ISC",
"dependencies": {
"@angular/common": "2.0.0",
"@angular/compiler": "2.0.0",
"@angular/core": "2.0.0",
"@angular/forms": "2.0.0",
"@angular/http": "2.0.0",
"@angular/platform-browser": "2.0.0",
"@angular/platform-browser-dynamic": "2.0.0",
"@angular/router": "3.0.0",
"core-js": "2.4.1",
"lodash": "4.16.1",
"rxjs": "5.0.0-beta.12",
"zone.js": "0.6.25"
},
"devDependencies": {
"@types/core-js": "0.9.33",
"@types/lodash": "4.14.35",
"@types/node": "6.0.39",
"awesome-typescript-loader": "2.2.4",
"css-loader": "0.23.1",
"jasmine-core": "2.4.1",
"karma": "1.1.1",
"karma-chrome-launcher": "1.0.1",
"karma-jasmine": "1.0.2",
"karma-mocha-reporter": "2.0.4",
"raw-loader": "0.5.1",
"to-string-loader": "1.1.4",
"ts-helpers": "1.1.1",
"typescript": "2.0.2",
"webpack": "1.13.1",
"webpack-dev-server": "1.14.1"
}
}
索引.html：
<!DOCTYPE html>
<html>
<head>
<meta charset=UTF-8>
<title>Retain</title>
<link rel="icon" href="data:;base64,iVBORw0KGgo=">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href='https://cdnjs.cloudflare.com/ajax/libs/normalize/4.1.1/normalize.min.css' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/flexboxgrid/6.3.0/flexboxgrid.min.css" type="text/css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons"
rel="stylesheet">
<link href="global.css" rel="stylesheet">
<base href="/">
</head>
<body>
<app>
... before angular loads.
</app>
<script src="polyfills.bundle.js"></script>
<script src="vendor.bundle.js"></script>
<script src="main.bundle.js"></script>
</body>
</html>
main.ts:
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { App } from './app/app';
const platform = platformBrowserDynamic();
platform.bootstrapModule(App);
platformBrowserDynamic().bootstrapModule(AppModule);
app.ts:
import { Component } from '@angular/core';
import { NgModule } from '@angular/core';
@Component({
selector: 'app',
template: `
<div>
<h3>
Yo, world!
</h3>
</div>
`
})
export class App {}
应用程序模块.ts：
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { App } from './app';
@NgModule({
imports: [BrowserModule],
declarations: [App],
bootstrap: [App]
})
export class AppModule{};
谢谢你的时间。
