diff --git a/app/Login.py b/app/Login.py
index 65047f7..f1317b2 100644
--- a/app/Login.py
+++ b/app/Login.py
@@ -5,6 +5,10 @@ from UseSqlite import InsertQuery, RecordQuery
 path_prefix = '/var/www/wordfreq/wordfreq/'
 path_prefix = './'  # comment this line in deployment
 
+def verify_pass(newpass,oldpass):
+    if(newpass==oldpass):
+        return True
+
 
 def verify_user(username, password):
     rq = RecordQuery(path_prefix + 'static/wordfreqapp.db')
@@ -47,6 +51,8 @@ def change_password(username, old_password, new_password):
     if not verify_user(username, old_password):  # 旧密码错误
         return False
     # 将用户名和密码一起加密，以免暴露不同用户的相同密码
+    if verify_pass(new_password,old_password): #新旧密码一致
+        return False
     password = md5(username + new_password)
     rq = InsertQuery(path_prefix + 'static/wordfreqapp.db')
     rq.instructions_with_parameters("UPDATE user SET password=:password WHERE name=:username", dict(
diff --git a/app/static/js/highlight.js b/app/static/js/highlight.js
index 2e0d84a..d91fb24 100644
--- a/app/static/js/highlight.js
+++ b/app/static/js/highlight.js
@@ -29,9 +29,10 @@ function highLight() {
     if (sel_word1 != null) {
         var list = sel_word1.value.split(" ");
         for (var i = 0; i < list.length; ++i) {
-            list[i] = list[i].replace(/(^\s*)|(\s*$)/g, "");
+            list[i] = list[i].replace(/(^\s*)|(\s*$)/g, "");//消除字符串两边空字符
             if (list[i] != "" && "<mark>".indexOf(list[i]) == -1 && "</mark>".indexOf(list[i]) == -1) {
-                txt = txt.replace(new RegExp(list[i], "g"), "<mark>" + list[i] + "</mark>");
+
+                txt = txt.replace(new RegExp("\\s"+list[i]+"\\s", "g"), " <mark>" + list[i] + "</mark> ");
             }
         }
     }
@@ -40,7 +41,7 @@ function highLight() {
         for (var i = 0; i < list2.length; ++i) {
             list2[i] = list2[i].replace(/(^\s*)|(\s*$)/g, "");
             if (list2[i] != "" && "<mark>".indexOf(list2[i]) == -1 && "</mark>".indexOf(list2[i]) == -1) {
-                txt = txt.replace(new RegExp(list2[i], "g"), "<mark>" + list2[i] + "</mark>");
+                txt = txt.replace(new RegExp("\\s"+list2[i]+"\\s", "g"), " <mark>" + list2[i] + "</mark> ");
             }
         }
     }