<app-quote *ngFor="let quote of quotes" (DeleteQuote)="deleteQuote($event)" [quote]="quote" ></app-quote>

要加上$event才能讀到emit(值)

2.findindex

[1,2,3].findIndex(x => x == 4);
// Returns an index value of -1.
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    (DeleteQuote)="deleteQuote($ev
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