diff --git a/src/global.ts b/src/global.ts
index 6951f34..95c369e 100644
--- a/src/global.ts
+++ b/src/global.ts
@@ -240,7 +240,7 @@ export function ctor() {
 }
 
 Array.prototype.random = function (this: Array<any>) {
-    return this[PublicShared.randomNum(0, this.length)];
+    return this[PublicShared.randomNum(0, this.length - 1)];
 };
 
 Array.prototype.intersection = function (this: Array<any>, other: Array<any>) {
diff --git a/src/shared/public/public.ts b/src/shared/public/public.ts
index 5860b9b..00092d8 100644
--- a/src/shared/public/public.ts
+++ b/src/shared/public/public.ts
@@ -116,7 +116,7 @@ export class PublicShared {
      * 随机生成区间范围整数
      */
     static randomNum(min: number, max: number) {
-        return Math.floor(Math.random() * (max - min) + min);
+        return Math.floor(Math.random() * (max - min + 1) + min);
     }
     /**获取道具配置 */
     static getAtnConf(atn: prizeType) {