更新全屏图标样式

src/components/app-full-scren/app-full-scren.vue

 <template>
     <div class="fullscren">
-        <Icon :type="fullScren == true ? 'ios-contract' : 'ios-expand'" size="20" @click="handleScreen"/>
+        <Icon :type="fullScren == true ? 'ios-contract' : 'ios-expand'" color="#aaa" size="22" @click="handleScreen"/>
     </div>
 </template>
 <script lang = 'ts'>
@@ -87,4 +87,10 @@ export default class AppFullScren extends Vue{
     cursor:pointer;
     padding: 0 5px;
 }
+.ivu-icon-ios-expand{
+    font-weight: bolder;
+}
+.ivu-icon-ios-contract{
+    font-weight: bolder;
+}
 </style>
\ No newline at end of file