ctx.draw(false,setTimeout(()=>{

                wx.canvasToTempFilePath({

                  canvas: textCanvas,  // 传入 canvas 对象

                  success(res) {

                    console.log('图片生成成功: ', res.tempFilePath);

                    // 可在这里展示图片，或进行上传操作

                  },

                  fail(err) {

                    console.log('图片生成失败: ', err);

                  }

                });

              },500))

报错信息： canvasToTempFilePath:fail