首页bug

@@ -57,7 +57,7 @@
                     <h2 class="up" v-show="rankChange > 0"><i>↑</i><b>{{rankChange}}</b>个名次</h2>
                     <h2 class="middle" v-show="rankChange == 0"><i>--</i><b>{{rankChange}}</b>个名次</h2>
                     <h2 class="down" v-show="rankChange < 0"><i>↓</i><b>{{-rankChange}}</b>个名次</h2>
-                    <h2 v-else><b>--</b>个名次</h2>
+                    <h2 v-show="!rankChange"><b>--</b>个名次</h2>
                 </div>
             </div>
 
@@ -166,7 +166,7 @@
                 }).then(function (response) {
                     var rs = response.data;
                     self.rankNow = rs.data.rankNow?rs.data.rankNow:'--';
-                    self.rankChange = rs.data.rankChange?rs.data.rankChange:'--';
+                    self.rankChange = rs.data.rankChange?rs.data.rankChange:null;
                     self.rankLevel = rs.data.rankLevel?rs.data.rankLevel:'';
                 }, function (response) {
                     var rs = response.data;