WeChatミニプログラムでスネークゲームを実装する方法

<!--snake.wxml-->
<view class="control" bindtouchstart="tapStart" bindtouchmove="tapMove" bindtouchend="tapEnd">
<view class="score">
  <view class="title">snake</view>
  <view class="scoredetail">
    <view class="scoredesc">得分</view>
    <view class="scorenumber">{{score}}</view>
  </view>
  <view class="scoredetail">
    <view class="scoredesc">历史最高</view>
    <view class="scorenumber">{{maxscore}}</view>
  </view>
</view>
<view class="ground">
  <view wx:for="{{ground}}" class="rows" wx:for-item="cols">
    <view wx:for="{{cols}}" class="block block_{{item}}" >
    </view>
  </view>
</view>
<modal class="modal" hidden="{{modalHidden}}" no-cancel bindconfirm="modalChange">
 <view> 游戏结束，重新开始吗？ </view>
</modal>
</view>