父元件 傳遞變數時須加上冒號 <template> <Product :main_category_id="main_category_id" :sub_category_id="sub_category_id"/></template> 子元件 接收props用法如下 <script setup> const props = defineProps({ main_category_id: String, sub_category_id: String }); //props.main_category_id</script> 本筆記參考: 1. https://www.netlify.com/blog/understanding-defineprops-and-defineemits-in-vue-3.22. https://juejin.cn/post/7111686386645729317