修复bug

pages/ticketlist.vue

@@ -139,7 +139,7 @@
 						</view>
 					</view>
 				</view>
-				<view class="book-btn full-btn" v-if="positionArr.length>=1&&sessionList>=1" @click="book()">确定</view>
+				<view class="book-btn full-btn" v-if="positionArr.length>=1&&sessionList.length>=1" @click="book()">确定</view>
 				<view class="full-btn gray" v-else>确定</view>
 			</view>
 			<!-- ticket end -->