diff --git a/Web12306/js/otn/queryticket.js b/Web12306/js/otn/queryticket.js
index ef3ea57..996adb9 100644
--- a/Web12306/js/otn/queryticket.js
+++ b/Web12306/js/otn/queryticket.js
@@ -165,7 +165,8 @@
 				"leftTicketDTO.to_station": to,
 				"purpose_codes": student ? "0X00" : "ADULT"
 			};
-			var cookie = (function (obj) { var arr = [];
+			var cookie = (function (obj) {
+				var arr = [];
 				_.forEach(obj, function (v, k) { arr.push(k + '=' + v); });
 				return arr.join("; ");
 			})(extensionVersion >= 720 ? {
@@ -199,7 +200,8 @@
 
 				}
 			}, false, {
-				"Cookie": cookie
+				"Cookie": cookie,
+				"If-Modified-Since": "0"
 			});
 		};
 		var fetchTicketUrl = function () {
@@ -238,10 +240,10 @@
 		if (!isLogOpen || (lastLogTime && (new Date() - lastLogTime) < 5000))
 			return;
 		lastLogTime = new Date();
-		ajax.sendGet("leftTicket/log", "leftTicket/init", data, "json", function() {
-			
-		},function() {
-			
+		ajax.sendGet("leftTicket/log", "leftTicket/init", data, "json", function () {
+
+		}, function () {
+
 		}, false, {
 			"Cookie": cookies
 		});