@H_404_0@整理文档，搜刮出一个Angular 2实现自定义 双向绑定 属性的代码，稍微整理精简一下做下分享。

@Component({
selector: 'twoway',template: <input [(ngModel)]="username"&gt; @H_<a href="/tag/404/" target="_blank" class="keywords">404</a>_0@Hello {{username}}!</p>
})
export class TwoWayComponent implements OnInit {
constructor() { }

usernameValue: string;
@Output() usernameChange = new EventEmitter();

@Input()
get username() {
return this.usernameValue;
}
set username(val) {
this.usernameValue = val;
this.usernameChange.emit(this.usernameValue);
}

ngOnInit() {

}
}