refactor: use nuxt compatiable 4 folder

app/utils/random.ts

@@ -0,0 +1,15 @@
+/**
+ * 生成随机数组
+ */
+export function generateRandomArray(length: number, total = 1) {
+  const randomArr: number[] = []
+  for (let i = 0; i < total; i++) {
+    const randomIndex = Math.floor(Math.random() * length)
+    if (randomArr.includes(randomIndex)) {
+      i--
+      continue
+    }
+    randomArr.push(randomIndex)
+  }
+  return randomArr
+}