方法: background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAE8AAABPCAYAAACqNJiGAAAAGXRFW…ZY+Hkh2wfu5/EX/rbp56Wb7236eWk+/LyQbXTeV5H+FWAA7eqC0D2aO2cAAAAASUVORK5CYII=);

效果: background-image dot

renfer URL: http://javascript.ruanyifeng.com/tool/phantomjs.html