to: button text descript buy or order

pages/index/index.js

@@ -6,6 +6,7 @@ Page({
    */
   data: {
     locationStr: '定位地址…',
+    blanceCount: 0, // 剩余预约次数
     fileInfoList: [
       {
         id: '0',

pages/index/index.wxml

@@ -18,11 +18,11 @@
     <view class="blance desc">
       <view class="count">
         <text class="desc-text">剩余：</text>
-        <text class="bolder-text">0</text>
+        <text class="bolder-text">{{blanceCount}}</text>
       </view>
       <view class="desc-text b-text ittflex-jcs">次健康早筛服务权益</view>
     </view>
-    <view class="btn default-btn buy-btn">立即购买</view>
+    <view class="btn default-btn buy-btn">{{blanceCount == 0 ? '立即购买' : '立即预约'}}</view>
   </view>
   <view class="file-info">
     <view class="file-title">