延迟时间改为3秒 code review by zhaobiao

@@ -67,7 +67,7 @@ $consultForm.on('submit', function() {
             loading.hideLoadingMask();
         } else {
             tip.show('提交成功~');
-            setTimeout(window.history.go(-1), 4000);
+            setTimeout(window.history.go(-1), 3000);
         }
     }).fail(function() {
         tip.show('网络出了点问题~');