[英]Uncaught ReferenceError: System is not defined - Angular2
The index.html page loads on the screen and shows loading. index.html页面加载到屏幕上并显示加载。 However I don't see the text "My First Component " which i have defined in the template attribute of app.component.ts.
但是,我没有看到我在app.component.ts的模板属性中定义的文本“我的第一个组件”。 When I do a F12 to open up developer tools , I see error:
当我使用F12打开开发人员工具时,我看到错误:
Uncaught ReferenceError: System is not defined.
未捕获的ReferenceError:未定义系统。
It points to the first line in the app.component.js file. 它指向app.component.js文件中的第一行。 Can somebody tell me what the problem is ?
有人能告诉我问题是什么吗?
app.component.ts app.component.ts
import { Component } from '@angular/core';
@Component({
selector: 'pm-app',
template: `
<div>
<h1>{{pageTitle}}</h1>
<div> My First Component </div>
</div>
`
})
export class AppComponent {
pageTitle: string = 'Hello World';
}
tsconfig.json tsconfig.json
{
"compilerOptions": {
"target": "ES5",
"module": "system",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"moduleResolution": "node",
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
},
"exclude": [
"node_modules"
]
}
index.html 的index.html
<!DOCTYPE html>
<html>
<head>
<title>Angular 2 Application</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="app/app.component.css" rel="stylesheet" />
<!-- 1. Load libraries -->
<!-- IE required polyfills, in this exact order -->
<script src="node_modules/es6-shim/es6-shim.min.js"></script>
<script src="node_modules/zone.js/dist/zone.js"></script>
<script src="node_modules/reflect-metadata/Reflect.js"></script>
<script src="node_modules/rxjs/bundles/Rx.umd.js"></script>
<script src="node_modules/@angular/core/core.umd.js"></script>
<script src="node_modules/@angular/common/common.umd.js"></script>
<script src="node_modules/@angular/compiler/compiler.umd.js"></script>
<script src="node_modules/@angular/platform-browser/platform-browser.umd.js"></script>
<script src="node_modules/@angular/platform-browser-dynamic/platform-browser-dynamic.umd.js"></script>
<script src='app/app.component.js'></script>
<script src='app/main.js'></script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script>
System.config({
packages: {
app: {
format: 'register',
defaultExtension: 'js'
}
}
});
System.import('app/main')
.then(null, console.error.bind(console));
</script>
</head>
<body>
<pm-app>Loading..</pm-app>
</body>
</html>
main.ts main.ts
import { bootstrap } from '@angular/platform-browser-dynamic';
// Our main component
import { AppComponent } from './app.component';
bootstrap(AppComponent);
Try moving 试着移动
<script src="node_modules/systemjs/dist/system.src.js"></script>
above your rxjs script declaration 在您的rxjs脚本声明之上
Check the latest (RC1) quick start app: https://angular.io/guide/quickstart (A link to working plunker ) 检查最新的(RC1)快速启动应用程序: https : //angular.io/guide/quickstart ( 工作plunker的链接)
The index.html is now simplified index.html现在已经简化了
<head>
<title>Angular 2 QuickStart</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="styles.css">
<!-- 1. Load libraries -->
<!-- Polyfill(s) for older browsers -->
<script src="https://npmcdn.com/es6-shim@0.35.0/es6-shim.min.js"></script>
<script src="https://npmcdn.com/zone.js@0.6.12?main=browser"></script>
<script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
<script src="https://npmcdn.com/systemjs@0.19.27/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script src="systemjs.config.js"></script>
<script>
System.import('app').catch(function(err){ console.error(err); });
</script>
</head>
And many settings are moved to systemjs.config.js
许多设置都移动到
systemjs.config.js
/**
* PLUNKER VERSION (based on systemjs.config.js in angular.io)
* System configuration for Angular 2 samples
* Adjust as necessary for your application needs.
*/
(function(global) {
var ngVer = '@2.0.0-rc.1'; // lock in the angular package version; do not let it float to current!
//map tells the System loader where to look for things
var map = {
'app': 'app',
'@angular': 'https://npmcdn.com/@angular', // sufficient if we didn't pin the version
'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api', // get latest
'rxjs': 'https://npmcdn.com/rxjs@5.0.0-beta.6',
'ts': 'https://npmcdn.com/plugin-typescript@4.0.10/lib/plugin.js',
'typescript': 'https://npmcdn.com/typescript@1.8.10/lib/typescript.js',
};
//packages tells the System loader how to load when no filename and/or no extension
var packages = {
'app': { main: 'main.ts', defaultExtension: 'ts' },
'rxjs': { defaultExtension: 'js' },
'angular2-in-memory-web-api': { defaultExtension: 'js' },
};
var ngPackageNames = [
'common',
'compiler',
'core',
'http',
'platform-browser',
'platform-browser-dynamic',
'router',
'router-deprecated',
'upgrade',
];
// Add map entries for each angular package
// only because we're pinning the version with `ngVer`.
ngPackageNames.forEach(function(pkgName) {
map['@angular/'+pkgName] = 'https://npmcdn.com/@angular/' + pkgName + ngVer;
});
// Add package entries for angular packages
ngPackageNames.forEach(function(pkgName) {
// Bundled (~40 requests):
packages['@angular/'+pkgName] = { main: pkgName + '.umd.js', defaultExtension: 'js' };
// Individual files (~300 requests):
//packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' };
});
var config = {
// DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
transpiler: 'typescript',
typescriptOptions: {
emitDecoratorMetadata: true
},
map: map,
packages: packages
}
System.config(config);
})(this);
A link to fully working plunker could be found here , all details - https://angular.io/guide/quickstart 这里可以找到完整工作的plunker的链接,所有细节 - https://angular.io/guide/quickstart
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