wx.canvasToTempFilePath({ canvasId: "myCanvas", canvas: this.canvas, x:this.configs.x, y:this.configs.y, width:this.configs.width, height:this.configs.height, destWidth:this.configs.width * this.dpr, destHeight:this.configs.height * this.dpr, fileType: "png", quality: 1,
canvasToTempFilePath导出图片模糊问题，始终没有原图那么清晰...
