请问在vue3中该如何在子组件中判断emit注册的方法父组件是否传入呢？ #8092
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vue2中可以使用$listeners,那么vue3呢？我尝试使用useAttrs,但是即使父组件使用了v-on传入，也并不能通过useAttrs找到emit中所定义的。我清楚父组件中使用v-bind就可以找到，但是这就不使用emit了，还是有点疑惑该如何判断使用emit注册的方法父组件是否传入呢？ |
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Replies: 5 comments 4 replies
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你可以参考v-model的原理在结合一下jsx中的写法推导出 @change =>onChange |
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好的，非常感谢 |
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如果这个对你有帮助的话，可以标记为答案哈。 |
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你这也太局限了吧！我不可能每次使用的时候，我为了判断有没有使用，还要加一个属性吧。 |
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vue中默认不会吧 v-on 当做属性去暴露，你只能显式的在props去定义它为prop，才能对外暴露 |
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可以用useAttrs去检查，例如 useAttrs()['onChange'] |
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太复杂了, 现在有好的判断方法吗, 因为有些方法不是必须传递的 |
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vue 合并 defineProps 和 defineEmits 就没这问题了 |
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can u explain on english and i try help u xD |
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你可以参考v-model的原理在结合一下jsx中的写法推导出 @change =>onChange
demo