关键词:$event
监听鼠标事件
<button (click)="onClick($event)"></button>
$event 输出: MouseEvent {isTrusted: true, screenX: 395, screenY: 541, clientX: 284, clientY: 383, …}
监听键盘事件
<input (keydown.enter)= "onEnter($event)" type="text">
$event 输出:KeyboardEvent {isTrusted: true, key: "Enter", code: "Enter", location: 0, ctrlKey: false, …}
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