method中写两个方法：
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- 根据base64转图片的方法
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- 根据转换出blob格式的文件导出的方法
//base64转pngbase64ImgtoFile(dataurl, filename = 'file') {const arr = dataurl.split(',')const mime = arr[0].match(/:(.*?);/)[1]const suffix = mime.split('/')[1]const bstr = atob(arr[1])let n = bstr.lengthconst u8arr = new Uint8Array(n)while (n--) {u8arr[n] = bstr.charCodeAt(n)}return new File([u8arr], `${filename}.${suffix}`, {type: mime})},//图片下载downloadBlob(blob, filename) {const url = URL.createObjectURL(blob);const a = document.createElement('a');a.href = url;a.download = filename;a.click();URL.revokeObjectURL(url);}
传入base64的图片全路径，在合适的位置分别调用这两个方法，即可实现下载
var base64Img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAAXNSR0IArs4c6QAABAFJREFU
..........................DlzUWu+L9NALAI4D+JOIkszc5PuWNABcBbAbwGGt9ewmAFLKJ5n5s5iXEhZCvBQEgQ3YEdd1p4UQR9PpdH11dXWRmV8motPJZPJgIpH4bWVl5dDw8PAR3/ftE2B9BuzX6Ojo/kajYZvp/i5vhAYRXbBPs3YTdcuYlPIuZj7tOM4r2+n+vx6nPdR/x1T/Aau20TA//wiSAAAAAElFTkSuQmCC';var imgFile = this.base64ImgtoFile(base64Img);this.downloadBlob(imgFile, 'test.png')
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