diff --git a/static/js/main.js b/static/js/main.js
index 5ff2c4f..1034bfb 100644
--- a/static/js/main.js
+++ b/static/js/main.js
@@ -33,7 +33,7 @@ login = function () {
         errshow("手机号码有误，请重填！");
         return false;
     }
-    if (isNaN(code) || code.length < 4) {
+    if (code.length < 6) {
         errshow("密码过短，请重新输入！");
         return false;
     }