defineEmits

`defineEmits` 是 Vue 3 中用于定义组件事件的函数。它接受一个数组作为参数，该数组的每个元素都代表一个要定义的组件事件名称。在组件中使用这些事件时，可以通过 `$emit` 方法触发事件，然后在父组件中监听这些事件。在定义事件时，可以指定事件的参数类型和默认值。与 `defineProps` 类似，`defineEmits` 也是通过选项的方式在组件中使用。

相关问题

defineemits

Emits is a term that is commonly used in programming and refers to the act of generating or producing something, often in the form of events or signals. In the context of event-driven programming, emitting refers to the process of sending or broadcasting an event to notify other parts of the program that a specific action or condition has occurred.

For example, in JavaScript, an event emitter is an object that can emit events and notify registered listeners when those events occur. The emitter emits events by triggering callbacks associated with those events.

Here's an example to illustrate the concept:

// Create an event emitter
const emitter = new EventEmitter();

// Register a listener for the 'click' event
emitter.on('click', () => {
  console.log('Button clicked!');
});

// Emit the 'click' event
emitter.emit('click');  // Output: 'Button clicked!'

In this example, the emitter object emits the 'click' event, which triggers the registered callback function and logs 'Button clicked!' to the console.

Related questions:
1. What are some programming languages or frameworks that commonly use event emitters?
2. How can I implement my own event emitter in a programming language?
3. Can you explain the difference between emitting and broadcasting events?

vue defineEmits

Vue的defineEmits是Vue 3中的一个编译宏命令，类似于defineProps，用于在&lt;script setup&gt;中声明组件要触发的事件。通过使用defineEmits()宏来显式地声明组件的事件。与defineProps不同，defineEmits在setup中用于声明事件，而defineProps用于声明属性。defineEmits的主要用途是在父子组件之间进行事件的传递。所以，当你想要在Vue 3中定义和触发组件事件时，可以使用defineEmits来声明事件并在组件中触发它们。<em>1</em><em>2</em><em>3</em>
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