<!--index.wxml-->
<view class="container">
  <button bindtap="init" wx:if="{{!isLoaded}}">加载图表</button>
  <button bindtap="dispose" wx:if="{{isLoaded && !isDisposed}}">释放图表</button>
  <ec-canvas wx:if="{{!isDisposed}}" id="mychart-dom-bar" canvas-id="mychart-bar" ec="{{ ec }}"></ec-canvas>
</view>