diff --git a/zh-cn/application-dev/security/cryptoFramework-guidelines.md b/zh-cn/application-dev/security/cryptoFramework-guidelines.md
index 3a6c617b539141278bb9de46199bc774f69157bd..6b30f51e9df44a7b96a53cdf955a708980fa1815 100644
--- a/zh-cn/application-dev/security/cryptoFramework-guidelines.md
+++ b/zh-cn/application-dev/security/cryptoFramework-guidelines.md
@@ -1136,8 +1136,7 @@ function stringToUint8Array(str) {
   for (let i = 0, j = str.length; i < j; ++i) {
     arr.push(str.charCodeAt(i));
   }
-  let tmpArray = new Uint8Array(arr);
-  return tmpArray;
+  return new Uint8Array(arr);
 }
 
 // 以Promise方式完成摘要