我开始使用简单的Angular 2应用程序。但是当我添加lodash的导入并尝试使用它时,我收到错误并且应用程序停止工作,并且无法弄清楚问题是什么。
我在控制台中收到这两个错误:
Uncaught SyntaxError:意外的令牌< __ 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 $$ internal $$ publish @ angular2-polyfills.js:1494(匿名函数)@ angular2-polyfills.js:243run @ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $ asap $$ flush @ angular2-polyfills.js:1305 angular2-polyfills.js:138
未捕获的SyntaxError:意外的令牌< 评估http://localhost:3000/lodash 加载http://localhost:3000/app/app.jsrun时出错@ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $$ internal $$ tryCatch @ angular2-polyfills.js:1511lib $ es6 $ promise $$ internal $$ invokeCallback @ angular2-polyfills.js:1523lib $ es6 $ promise $$ internal $$ publish @ angular2-polyfills.js:1494lib $ es6 $ promise $$ internal $$ publishRejection @ angular2-polyfills.js:1444(匿名函数)@ angular2-polyfills.js:243run @ angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib $ es6 $ promise $ asap $$ flush @ angular2-polyfills.js:1305
文件
的index.html
{
"compilerOptions": {
"target": "es5",
"module": "system",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": false
},
"exclude": [
"node_modules"
]
}
tsconfig.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"
}
}
的package.json
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);
{{1}}
答案 0 :(得分:14)
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,您可以按照以下说明使用它:
import _ from 'lodash';
_.forEach([1,2,3], function(e) {
console.log(e);
});
此问题可以帮助您:https://github.com/systemjs/systemjs/issues/951。
亨利
答案 1 :(得分:2)
全力以赴:
安装所有直通终端:
npm install lodash --save
tsd install lodash --save
在index.html中添加路径
<script>
System.config({
packages: {
app: {
format: 'register',
defaultExtension: 'js'
}
},
paths: {
lodash: './node_modules/lodash/lodash.js'
}
});
System.import('app/init').then(null, console.error.bind(console));
</script>
在.ts文件的顶部导入lodash
import * as _ from 'lodash'
答案 2 :(得分:0)
我解决了以下列方式导入lodash:
import * as _ from 'lodash';
在systemjs.config.js中我定义了这个:
map: { 'lodash' : 'node_modules/lodash/lodash.js' }