Question

我使用typescript构建一个角度2应用程序，我尝试创建新的组件调用sidekik.component.ts并导入到这样的app.component.ts。

app.component.ts

import {Component} from 'angular2/core';
import {SideKikComponent} from './classes/sidekik.component';

interface Hero {
   id: number;
   name: string;
}

@Component({
  selector: 'my-app',
  directives:[
    SideKikComponent,
  ],
  templateUrl:'app/views/heros.html',
  styleUrls: ['app/css/site.css']
})

export class AppComponent { 
  public title = 'Tour of Heroes';
  public heroes =HEROS;
  public selectedHero: Hero;

  onSelect(hero: Hero) { 
    this.selectedHero = hero; 
  }
}

var HEROS: Hero[] =[
  {"id":1,"name":"SuperMan"},
  {"id":2,"name":"Captain America"},
  {"id":3,"name":"Thor"},
  {"id":4,"name":"Iorn Man"},
  {"id":5,"name":"Ant Man"}
];

sidekik.component.ts

import {Component, View} from 'angular2/core';

@Component({
  selector:'sidekik',
  events:['hit'],
  properties:['define'],
  template: `
    <sidekik (click) = "hit(define)"></sidekik>
`,

});

export class SideKikComponent{
    hit(define:string){
    console.log(define);
  }
}

然后我运行npm start它显示

rumes@rumes-HP-ProBook-4530s:/var/www/html/angular2ts$ tsc --version
message TS6029: Version 1.7.5
rumes@rumes-HP-ProBook-4530s:/var/www/html/angular2ts$ npm start

> angular2ts@1.0.0 start /var/www/html/angular2ts
> concurrent "npm run tsc:w" "npm run lite" 

[0] 
[0] > angular2ts@1.0.0 tsc:w /var/www/html/angular2ts
[0] > tsc -w
[0] 
[1] 
[1] > angular2ts@1.0.0 lite /var/www/html/angular2ts
[1] > lite-server
[1] 
[1] [BS] Access URLs:
[1]  ------------------------------------
[1]        Local: http://localhost:3000
[1]     External: http://192.168.1.7:3000
[1]  ------------------------------------
[1]           UI: http://localhost:3001
[1]  UI External: http://192.168.1.7:3001
[1]  ------------------------------------
[1] [BS] Serving files from: ./
[1] [BS] Watching files...
[0] app/classes/sidekik.component.ts(11,3): error TS1146: Declaration  expected.
[1] 15.12.17 16:04:28 304 GET /./index.html (Unknown - 29ms)
[0] 4:04:28 PM - Compilation complete. Watching for file changes.
[1] 15.12.17 16:04:28 304 GET /node_modules/angular2/bundles/angular2-polyfills.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/systemjs/dist/system.src.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/rxjs/bundles/Rx.js (Unknown - 310ms)
[1] 15.12.17 16:04:28 304 GET /node_modules/angular2/bundles/angular2.dev.js (Unknown - 310ms)
[1] [BS] File changed: app/classes/sidekik.component.js
[1] [BS] File changed: app/app.component.js
[1] [BS] File changed: app/boot.js
[1] 15.12.17 16:04:29 200 GET /app/boot.js (Unknown - 40ms)
[1] 15.12.17 16:04:30 200 GET /app/app.component.js (Unknown - 92ms)
[1] 15.12.17 16:04:30 200 GET /app/classes/sidekik.component.js (Unknown - 75ms)
[1] 15.12.17 16:04:31 304 GET /app/views/heros.html (Unknown - 227ms)
[1] 15.12.17 16:04:31 404 GET /favicon.ico (Unknown - 229ms)

任何人都可以帮我这个吗？。

Answer 1

我有同样的问题（在ts编译时发出Typescript Declaration expected），虽然它也表现为Angular在浏览器中引发的异常：

No Directive annotation found on [Errant Module]

这对我有用：

删除@Component(); 末尾的分号（sidekik.component.ts）

一个简单的解释是装饰器是表达式，它们返回一个函数。也就是说，装饰器不是语句。语句告诉编译器要做的事情，并且需要停止分号（或新行）。表达式只返回值。

所以装饰者不能以分号结尾，因为它们不是语句，因为如果可以的话，这将使编写JS引擎的人的生活更加艰难（这是一个猜测）。

您可以详细了解装饰器here。

Answer 2

问题是将@Component（）与SideKikComponent类分开的分号。 @Component是附加到其后面的类的注释。所以一堂课必须遵循它。如果删除半冒号以及导出的类，以便@Component（）位于文件的底部，则会得到完全相同的错误，因为@Component需要一个类。

＆＃34; @Component是一个注释，它告诉Angular，注释附加到的类是一个组件。＆＃34; - http://blog.thoughtram.io/angular/2015/05/03/the-difference-between-annotations-and-decorators.html

Typescript使用Angular 2组件

2 个答案: