canvasToTempFilePath:fail:canvasId do not exist" ?

开发者工具调用 没啥反应  真机调试 就报错

canvasId 找不到

用的是 taro 框架

代码

Taro.canvasToTempFilePath({

      quality: .8,

      fileType: ‘jpg’,

      canvasId: ‘mycanvas’,

      success: res => {

        console.log(‘canvasToTempFilePathsuccess’, res)

        this.setState({

          tempFilePath: res.tempFilePath

        })

      },

      fail: res => {

        console.log(‘canvasToTempFilePathfail’, res)

      },

      complete: a => {

        console.log(‘aaa’, a)

      }

    }, this)

html

<Canvas style={`width: ${width}px; height: ${height}px;`} className=‘huabu’ canvasId=‘mycanvas’ />