我看web版的drawImage方法的图片资源可以是另一个canvas，那小程序可以吗，或者有什么其他方法

开发工具可以 手机上预览这个方法不行： ctx1.drawImage(ctx.canvas,0,0)  const queryTwo = wx.createSelectorQuery()       queryTwo.select('#myCanvasTwo')         .fields({ node: true, size: true })         .exec((res) => {             console.log(res)           const canvas = res[0].node           var ctx = canvas.getContext('2d')                      const query = wx.createSelectorQuery()           query.select('#myCanvas3')             .fields({ node: true, size: true })             .exec((res) => {                 console.log(res)               const canvas1 = res[0].node               const ctx1 = canvas1.getContext('2d')               console.log(ctx1)               const dpr2 = wx.getSystemInfoSync().pixelRatio               canvas1.width = res[0].width * dpr2               canvas1.height = res[0].height * dpr2               console.log(dpr2)               console.log(ctx1)               console.log(canvas1.width)               console.log(canvas1.height)               console.log(ctx)               // ctx1.scale(dpr, dpr)                           ctx1.drawImage(ctx.canvas,0,0)                            })         })