examples: add confirm delete example (#1466)

* examples: add confirm delete example

* docs: add confirm delete example

docs/examples/confirm-delete/useDialog.js

@@ -0,0 +1,29 @@
+import { ref } from 'vue'
+
+const isVisible = ref(false)
+const message = ref('')
+let resolveCallback
+
+export function useDialogState() {
+  return {
+    isVisible,
+    message,
+    resolve: (value) => {
+      if (resolveCallback) {
+        resolveCallback(value)
+      }
+    },
+  }
+}
+
+export function useDialog() {
+  return {
+    confirm(msg) {
+      isVisible.value = true
+      message.value = msg
+      return new Promise((resolve) => {
+        resolveCallback = resolve
+      })
+    },
+  }
+}