Data URI scheme支持的类型如下：
data:image/gif
data:image/gif;base64,base64编码的gif图片数据
如：data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw== 1px 空白图片
data:image/png
data:image/png;base64,base64编码的png图片数据
如：data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAACklEQVQYV2P4DwABAQEAWk1v8QAAAABJRU5ErkJggg==
data:image/jpeg
data:image/jpeg;base64,base64编码的jpeg图片数据
如：data:image/jpeg;base64,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
data:image/x-icon
data:image/x-icon;base64,base64编码的x-icon图片数据
如：data:image/x-icon;base64,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
data:text/javascript
data:text/javascript,Javascript代码 或 data:text/javascript;base64,base64编码的Javascript代码
如：data:text/javascript,alert(123)
如：data:text/javascript;base64,YWxlcnQoMTIzKQ==
data:text/html
data:text/html,HTML代码 或 data:text/html;base64,base64编码的HTML代码
如：data:text/html,<h1>This Hello</h1>
如：data:text/html;base64,PGgxPlRoaXMgSGVsbG88L2gxPg==
data:text/css
data:text/css,CSS代码 或 data:text/css;base64,base64编码的CSS代码
如：data:text/css,body{color:blue}
如：data:text/css;base64,Ym9keXtjb2xvcjpibHVlfQ==
data:text/plain
data:text/plain,文本数据 或 data:text/plain;base64,base64编码的文本数据
如：data:text/plain,This is text
如：data:text/plain;base64,VGhpcyBpcyB0ZXh0
data:
data:,文本数据 或 data:;base64,base64编码的文本数据
如：data:,This is text
如：data:;base64,VGhpcyBpcyB0ZXh0