fix: 修复调用图表的dispose时报异常

Author: whinc

ec-canvas/wx-canvas.js

@@ -37,6 +37,10 @@ export default class WxCanvas {
     // noop
   }
 
+  removeEventListener() {
+    // noop
+  }
+
   attachEvent() {
     // noop
   }

pages/lazyLoad/index.wxml

@@ -1,6 +1,6 @@
 <!--index.wxml-->
 <view class="container">
-  <button bindtap="init" wx:if="{{!isLoaded}}">加载图表</button>
+  <button bindtap="init" wx:if="{{!isLoaded || isDisposed}}">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>
+  <ec-canvas id="mychart-dom-bar" canvas-id="mychart-bar" ec="{{ ec }}"></ec-canvas>
 </view>