angular2失败的lodash导入

Question

angular2失败的lodash导入

Mil*_*vic 3 javascript ecmascript-6 angular

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,我得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:

未捕获的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 @ angular2-polyfills.js时出错: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 $承诺$ asap $$ flush @ angular2-polyfills.js:1305

FILES

的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>

Run Code Online (Sandbox Code Playgroud)

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  },
  "exclude": [
    "node_modules"
  ]
}

Run Code Online (Sandbox Code Playgroud)

的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"
  }
}

Run Code Online (Sandbox Code Playgroud)

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);

Run Code Online (Sandbox Code Playgroud)

Answer 1

Thi*_*ier 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' }
  }
}

Run Code Online (Sandbox Code Playgroud)

在TS文件中,您可以按如下所述使用它:

import _ from 'lodash';
_.forEach([1,2,3], function(e) {
  console.log(e);
});

Run Code Online (Sandbox Code Playgroud)

这个问题可以帮到你:https://github.com/systemjs/systemjs/issues/951.

蒂埃里

归档时间：	10 年前
查看次数：	6057 次
最近记录：	9 年，6 月前