diff --git a/docs/chapter_searching/hashing_search.md b/docs/chapter_searching/hashing_search.md
index 19cb2c8e..37b5032d 100644
--- a/docs/chapter_searching/hashing_search.md
+++ b/docs/chapter_searching/hashing_search.md
@@ -80,10 +80,10 @@ comments: true
 
     ```typescript title="hashing_search.ts"
     /* 哈希查找（数组） */
-    function hashingSearch(map: Map<number, number>, target: number) {
+    function hashingSearch(map: Map<number, number>, target: number): number {
         // 哈希表的 key: 目标元素，value: 索引
         // 若哈希表中无此 key ，返回 -1
-        return map.has(target) ? map.get(target) : -1;
+        return map.has(target) ? map.get(target) as number : -1;
     }
     ```