1.base64转file文件对象

javascript">//将base64转换为文件
dataURLtoFile(dataurl, filename) { var arr = dataurl.split(','),mime = arr[0].match(/:(.*?);/)[1],bstr = atob(arr[1]),n = bstr.length,u8arr = new Uint8Array(n);while (n--) {u8arr[n] = bstr.charCodeAt(n);}return new File([u8arr], filename, { type: mime });
}//调用
var file = dataURLtoFile(base64Data, imgName);