我启动了简单的Angular 2应用程序,一切正常。但是,当我添加lodash的导入并尝试使用它时,出现错误,该应用程序停止运行,并且无法找出问题所在。
我在控制台中收到以下2个错误:
未捕获到的SyntaxError:意外令牌<__ exec @ system.src.js:1374entry.execute @ system.src.js:3300linkDynamicModule @ system.src.js:2921link @ system.src.js:2764execute @ system.src.js:3096doDynamicExecute @ system.src.js:715link @ system.src.js:908doLink @ system.src.js:569updateLinkSetOnLoad @ system.src.js:617(匿名函数)@ system.src.js:430run @ angular2-polyfills.js: 138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $$ internal $$ tryCatch @ angular2-polyfills.js:1511lib $ es6 $ promise $$ internal $$ invokeCallback @ angular2-polyfills.js:1523lib $ es6 $ promise $ $内部$$发布@ angular2-polyfills.js:1494(匿名函数)@ angular2-polyfills.js:243run @ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $ asap $$ flush @ angular2-polyfills.js:1305 angular2-polyfills.js:138
未捕获到的SyntaxError:意外的令牌<正在评估http:// localhost:3000 / lodash加载http:// localhost:3000 / app / app.jsrun @ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $$内部[email protected]:1511lib$es6$promise$$internal$$invokeCallback@angular2-polyfills.js:[email protected]: 1494lib $ es6 $ promise $$内部$$ publishRejection @ angular2-polyfills.js:1444(匿名函数)@ angular2-polyfills.js:243run @ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise2-asap $$ flush @ angular2-polyfills.js:1305
档案
index.html
<html>
<head>
<title>Angular 2 QuickStart</title>
<!-- 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/systemjs/dist/system-polyfills.js"></script>
<script src="node_modules/angular2/bundles/angular2-polyfills.js"></script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="node_modules/rxjs/bundles/Rx.js"></script>
<script src="node_modules/angular2/bundles/angular2.dev.js"></script>
<!-- 2. Configure SystemJS -->
<script>
System.config({
packages: {
app: {
format: 'register',
defaultExtension: 'js'
}
}
});
System.import('app/app')
.then(null, console.error.bind(console));
</script>
</head>
<!-- 3. Display the application -->
<body>
<my-app>Loading...</my-app>
</body>
</html>
tsconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "system",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": false
},
"exclude": [
"node_modules"
]
}
package.json
{
"name": "angular2-quickstart",
"version": "1.0.0",
"scripts": {
"tsc": "tsc",
"tsc:w": "tsc -w",
"lite": "lite-server",
"start": "concurrent \"npm run tsc:w\" \"npm run lite\" "
},
"license": "ISC",
"dependencies": {
"angular2": "2.0.0-beta.2",
"es6-promise": "^3.0.2",
"es6-shim": "^0.33.3",
"lodash": "^4.1.0",
"reflect-metadata": "0.1.2",
"rxjs": "5.0.0-beta.0",
"systemjs": "0.19.6",
"zone.js": "0.5.10"
},
"devDependencies": {
"concurrently": "^1.0.0",
"lite-server": "^1.3.4",
"typescript": "^1.7.5"
}
}
import {bootstrap} from 'angular2/platform/browser'
import {Component} from 'angular2/core';
import * as _ from 'lodash';
@Component({
selector: 'my-app',
template: '<h1>My First Angular 2 App with lodash</h1>'
})
export class AppComponent {
constructor(){
console.log(_.last([1, 2, 3]));
console.log('hello');
}
}
bootstrap(AppComponent);
也许您可以在SystemJS级别尝试此配置:
System.config({
(...)
map: {
lodash: 'node_modules/lodash/lodash.js'
},
meta: {
lodash: { format: 'amd' }
}
}
在TS文件中,您可以按以下说明使用它:
import _ from 'lodash';
_.forEach([1,2,3], function(e) {
console.log(e);
});
这个问题可以帮助您:https : //github.com/systemjs/systemjs/issues/951。
蒂埃里
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