@Component({
template : `<p>你好</p>`
})
export class AlertComponent {

 constructor(){
 }
}

//必须声明两处
declarations: [ AlertComponent],
entryComponents : [ AlertComponent]

//注入MdDialog对象
constructor(private mdDialog : MdDialog) { }
//打开
this.mdDialog.open(AlertComponent)

@Component({
template : `<div md-dialog-title>'确认操作'</div>
      <div md-dialog-content>确认执行操作?</div>
      <div md-dialog-actions>
       <button md-button (click)="mdDialogRef.close('ok')">确认</button>
       <button md-button (click)="mdDialogRef.close('cancel')">取消</button>
      </div>`
})
export class ConfirmComponent {
 constructor(private mdDialogRef : MdDialogRef<DialogComponent>){ }
}

//必须声明两处
declarations: [ ConfirmComponent],
entryComponents : [ ConfirmComponent]

//注入MdDialog对象
constructor(private mdDialog : MdDialog) { }
//打开
this.mdDialog.open(ConfirmComponent).subscribe(res => {
 res === 'ok' && dosomething
});

export declare class MdDialogConfig {
  viewContainerRef?: ViewContainerRef;
  /** The ARIA role of the dialog element. */
  role?: DialogRole;
  /** Whether the user can use escape or clicking outside to close a modal. */
  disableClose?: boolean;
  /** Width of the dialog. */
  width?: string;
  /** Height of the dialog. */
  height?: string;
  /** Position overrides. */
  position?: DialogPosition;
  /** Data being injected into the child component. */
  data?: any;
}

config : any;
constructor(private mdDialogRef : MdDialogRef<AlertComponent>){
  this.config = mdDialogRef.config.data || {};
}

//alert.component.html
<div class="title" md-dialog-title>{{config?.title || '提示'}}</div>
<div class="content" md-dialog-content>{{config?.content || ''}}</div>
<div class="actions" *ngIf="!(config?.hiddenButton)" md-dialog-actions>
 <button md-button (click)="mdDialogRef.close()">{{config?.button || '确认'}}</button>
</div>

//alert.component.scss
.title, .content{
 text-align: center;
}
.actions{
 display: flex;
 justify-content: center;
}

//alert.component.ts
@Component({
 selector: 'app-alert',
 templateUrl: './alert.component.html',
 styleUrls: ['./alert.component.scss']
})
export class AlertComponent {

 config : {};

 constructor(private mdDialogRef : MdDialogRef<AlertComponent>){
  this.config = mdDialogRef.config.data || {};
 }

}

constructor(private mdDialog : MdDialog) { }

let config = new MdDialogConfig();
config.data = {
  content : '你好'
}
this.mdDialog.open(AlertComponent, config)

@Injectable()
export class CustomDialogService {

 constructor(private mdDialog : MdDialog) { }

 //封装confirm，直接返回订阅对象
 confirm(contentOrConfig : any, title ?: string) : Observable<any>{
  let config = new MdDialogConfig();
  if(contentOrConfig instanceof Object){
   config.data = contentOrConfig;
  }else if((typeof contentOrConfig) === 'string'){
   config.data = {
    content : contentOrConfig,
    title : title
   }
  }
  return this.mdDialog.open(DialogComponent, config).afterClosed();
 }

 //同
 alert(contentOrConfig : any, title ?: string) : Observable<any>{
  let config = new MdDialogConfig();
  if(contentOrConfig instanceof Object){
   config.data = contentOrConfig;
  }else if((typeof contentOrConfig) === 'string'){
   config.data = {
    content : contentOrConfig,
    title : title
   }
  }
  return this.mdDialog.open(AlertComponent, config).afterClosed();
 }

constructor(dialog : CustomDialogService){}

this.dialog.alert('你好');
this.dialog.alert('你好','标题');
this.dialog.alert({
  content : '你好',
  title : '标题',
  button : 'ok'
});
this.dialog.confirm('确认吗').subscribe(res => {
  res === 'ok' && dosomething
});