diff --git a/src/utils/index.ts b/src/utils/index.ts
index bc2d71c..7220245 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -17,9 +17,9 @@ export function dateFormat(dateStr: string) {
 }
 
 export const generateUUID = (): string => {
-  var guid = "";
-  for (var i = 1; i <= 32; i++) {
-    var n = Math.floor(Math.random() * 16.0).toString(16);
+  let guid = "";
+  for (let i = 1; i <= 32; i++) {
+    let n = Math.floor(Math.random() * 16.0).toString(16);
     guid += n;
     if (i === 8 || i === 12 || i === 16 || i === 20) guid += "-";
   }