- 当前 Bug 的表现（可附上截图） 初始化阶段 [图片] 重新渲染 [图片] - 预期表现 通过wx:if=''重新渲染后canvas标签有显示出来但是并没有在真机与模拟器上再次出现canvas图像 - 复现路径 - 提供一个最简复现 Demo html <view class='bac' bindtap='test'></view> <view wx:if='{{show}}'>   <canvas style="width: 300px; height: 200px;" canvas-id="firstCanvas"></canvas> </view> css .bac{   width: 100rpx;   height: 100rpx;   background: #000; } //js Page({   data:{     show:true   },   test:function(){     let that = this;     if(that.data.show == true){       that.setData({         show:false       })     }else{       that.setData({         show:true       })     }   },   canvasIdErrorCallback: function (e) {     console.error(e.detail.errMsg)   },   onReady: function (e) {     // 使用 wx.createContext 获取绘图上下文 context     var context = wx.createCanvasContext('firstCanvas')     context.setStrokeStyle("#00ff00")     context.setLineWidth(5)     context.rect(0, 0, 200, 200)     context.stroke()     context.setStrokeStyle("#ff0000")     context.setLineWidth(2)     context.moveTo(160, 100)     context.arc(100, 100, 60, 0, 2 * Math.PI, true)     context.moveTo(140, 100)     context.arc(100, 100, 40, 0, Math.PI, false)     context.moveTo(85, 80)     context.arc(80, 80, 5, 0, 2 * Math.PI, true)     context.moveTo(125, 80)     context.arc(120, 80, 5, 0, 2 * Math.PI, true)     context.stroke()     context.draw()   } })