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                >[success] # $ref -- defineExpose 1. 使用`<script setup>`的組件是**默認關閉**的——即通過模板引用或者`$parent`鏈獲取到的組件的公開實例,**不會**暴露任何在`<script setup>`中聲明的綁定 2. `defineExpose`編譯器宏來顯式指定在`<script setup>`組件中要暴露出去的屬性 3. ref 會和在普通實例中一樣被自動解包 ~~~html <script setup> import { ref } from 'vue' const a = 1 const b = ref(2) defineExpose({ a, b }) </script> ~~~ >[info] ## 官網 [#defineexpose](https://cn.vuejs.org/api/sfc-script-setup.html#defineexpose)
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