Base64目前主要用于HTML5、移动开发等不考虑IE6的场景中。
data:[][;charset=][;base64],
.demoImg{ background-image : url("data:image/jpg;base64,/9j/4QMZRXhpZgAASUkqAAgAAAAL....") ; }
<img width=" 40 " height=" 30 " src=" data:image/jpg;base64,/9j/4QMZRXhpZgAASUkqAAgAAAAL.... " />