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components/selectPopup/selectPopupPlugin.js

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+// plugins/selectPopup.js
+import {
+    createApp
+} from 'vue';
+import SelectPopup from './selectPopup.vue';
+
+export default {
+    install(app) {
+        const popupApp = createApp(SelectPopup);
+        // #ifdef H5
+        const popupInstance = popupApp.mount(document.createElement('div'));
+        document.body.appendChild(popupInstance.$el);
+
+        // 提供 open 方法
+        const openPopup = (config) => {
+            popupInstance.open(config);
+        };
+        // #endif
+
+        // #ifndef H5
+        const openPopup = (config) => {};
+        // #endif
+        // 提供给所有组件使用
+        app.provide('openSelectPopup', openPopup);
+    }
+};