#鸿蒙通关秘籍#ArkUI框架中的事件传递机制是如何运行的，能否讲一个例子说说？

// 在UIAbility中注册事件
export default class EntryAbility extends UIAbility {
    onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
        let eventhub = this.context.eventHub;
        eventhub.on('greet', this.greetEvent);
    }

    greetEvent(name: string): void {
        console.log(`Hello, ${name}!`);
    }
}
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// 在UI中触发事件
@Entry@Component
struct GreetingPage {
    private context = getContext(this);

    build() {
        Button('Greet')
        .onClick(() => {
            this.context.eventHub.emit('greet', 'World');
        });
    }
}
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