diff --git a/html/static/js/main.js b/html/static/js/main.js
index a590cc5..0194aeb 100755
--- a/html/static/js/main.js
+++ b/html/static/js/main.js
@@ -1,51 +1,52 @@
-function api_invoke(uri, params, callback){
+function api_invoke(uri, params, callback) {
     $.ajax({
-        url:uri,
-        data:params,
-        type:'POST',
-        cache:false,
-        dataType:'json',
-        success:function(data) {
+        url: uri,
+        data: params,
+        type: 'POST',
+        cache: false,
+        dataType: 'json',
+        success: function (data) {
             callback(data);
-         },
-         error : function(XMLHttpRequest, textStatus, errorThrown) {
-              if ("undefined" == typeof(XMLHttpRequest.responseJSON)) {
+        },
+        error: function (XMLHttpRequest, textStatus, errorThrown) {
+            if (XMLHttpRequest.status == 302) {
+                location.href = "/login.html";
+                return;
+            }
+            if ("undefined" == typeof(XMLHttpRequest.responseJSON)) {
                 alert("System error, please try again later.");
                 return;
-              };
-              alert(XMLHttpRequest.responseJSON.msg);
-         }
+            }
+            alert(XMLHttpRequest.responseJSON.msg);
+        }
     });
 }
 
-function load_page(pageUrl){
+function load_page(pageUrl) {
     $(".content-wrapper").load(pageUrl);
 }
 
-function get_query_string(name)
-{
-     var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
-     var r = window.location.search.substr(1).match(reg);
-     if(r!=null)return  unescape(r[2]); return null;
+function get_query_string(name) {
+    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
+    var r = window.location.search.substr(1).match(reg);
+    if (r != null)return unescape(r[2]);
+    return null;
 }
 
-function is_ip(ip)   
-{   
-    var re =  /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/
-    return re.test(ip);   
+function is_ip(ip) {
+    var re = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/
+    return re.test(ip);
 }
 
-function check_port(port) 
-{
-    if (port>65535) {
+function check_port(port) {
+    if (port > 65535) {
         return false;
     }
     var re = /^[1-9]+[0-9]*]*$/
     return re.test(port);
 }
 
-function check_weight(weight) 
-{
+function check_weight(weight) {
     var re = /^[1-9]+[0-9]*]*$/
     return re.test(weight);
 }