上面是原图：

下面是draw后canvasToTempFilePath生成图片：

正常的pc：wx.getSystemInfoSync().pixelRatio： 1

不全的pc：wx.getSystemInfoSync().pixelRatio： 1.5

宽高打印出来的数据一致

html片段：

   
js片段：
ctx.draw(false, () => {
              wx.canvasToTempFilePath(
                {
                  x: 0,
                  y: 0,
                  // width: _this.data.boxWidth,
                  // height: _this.data.boxHeight,
                  width: tempPosition.dWidth,
                  height: tempPosition.dHeight,
                  // destWidth: _this.data.boxWidth * wx.getSystemInfoSync().pixelRatio,
                  // destHeight: _this.data.boxHeight * wx.getSystemInfoSync().pixelRatio,
                  // destWidth: tempPosition.dWidth * wx.getSystemInfoSync().pixelRatio,
                  // destHeight: tempPosition.dHeight * wx.getSystemInfoSync().pixelRatio,
                  destWidth: tempPosition.dWidth,
                  destHeight: tempPosition.dHeight,
                  fileType: 'png',
                  quality: 1,
                  canvasId: 'tempCanvas',
                  success(res) {
                    console.log('编辑成功', res.tempFilePath)
                    wx.hideLoading()
                    _this.triggerEvent('editorImageOk', {
                      tempFilePath: res.tempFilePath
                    })
                  },
                  fail() {
                    console.log('编辑失败', e)
                    wx.hideLoading()
                    wx.showToast({ title: '保存失败', icon: 'none' })
                    _this.closelEditor()
                  }
                },
                _this
              )
            })

thinkpad笔记本，分辨率1920*1080，微信版本3.1.0.67, 小程序基础库2.15.0。
部分PC电脑版微信 小程序wx.canvasToTempFilePath生成图片显示不全。不是开发者工具！