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)
谁能帮我这个? .
2 回答
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在浏览器中抛出的异常:No Directive annotation found on [Errant Module]
这对我有用:
Remove the semicolon at the end of your @Component(); (sidekik.component.ts)
一个简单的解释是装饰器是返回函数的表达式 . 也就是说,装饰者不是声明 . 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(这是猜测) .
您可以了解有关装饰器here的更多信息 .
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 .
"@Component is an annotation that tells Angular, that the class, which the annotation is attached to, is a component." - http://blog.thoughtram.io/angular/2015/05/03/the-difference-between-annotations-and-decorators.html