base64常用前缀

文件后缀	前缀格式
.doc	data:application/msword;base64,
docx	data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,
.xls	data:application/vnd.ms-excel;base64,
xlsx	data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,
.pdf	data:application/pdf;base64,
.ppt	data:application/vnd.ms-powerpoint;base64,
pptx	data:application/vnd.openxmlformats-officedocument.presentationml.presentation;base64,
.txt	data:text/plain;base64,
.png	data:image/png;base64,
.jpg	data:image/jpeg;base64,
.gif	data:image/gif;base64,
.svg	data:image/svg+xml;base64,
.ico	data:image/x-icon;base64,
.bmp	data:image/bmp;base64,

参考链接：https://blog.csdn.net/weixin_42614981/article/details/107176914