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                在vue3中建議申明`emits`選項來定義組件要觸發的自定義事件 ~~~ <template> <div> <p>{{ text }}</p> <button @click="$emit('accepted')">OK</button> </div> </template> <script> export default { props: ['text'], emits: ['accepted'] //定義要觸發的自定義事件 } </script> ~~~ 支持數組和對象的形式定義,對象的形式定義可以驗證自定義事件 ``` const app = createApp({}) // 數組語法 app.component('todo-item', { emits: ['check'], created() { this.$emit('check') } }) // 對象語法 app.component('reply-form', { emits: { // 沒有驗證函數 click: null, // 帶有驗證函數 submit: payload => { //驗證觸發的自定義事件參數是否包含email和password字段 if (payload.email && payload.password) { return true } else { console.warn(`Invalid submit event payload!`) return false } } } }) ```
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