url引用格式：url('data:image/svg+xml;base64')
實例：
准備好SVG文件
源碼：
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <style> body{
/*base64代碼--直接復制SVG文件里的所有代碼*/ background: rgb(255,255,255) url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='100' viewBox='0 0 200 100' preserveAspectRatio='none'><defs><radialGradient id='rg1' cx='0%' cy='0%' r='100%' fx='0%' fy='0%'><stop offset='0%' style='stop-color: #a480ff; stop-opacity: 0.5' /><stop offset='100%' style='stop-color: #a480ff; stop-opacity:0' /></radialGradient><radialGradient id='rg2' cx='100%' cy='0%' r='100%' fx='100%' fy='0%'><stop offset='0%' style='stop-color: #ff8f83; stop-opacity: 0.5' /><stop offset='100%' style='stop-color: #ff8f83; stop-opacity:0' /></radialGradient></defs><polygon points='0,0 125,0 125,100 0,100' style='fill: url(#rg1);' /><polygon points='75,0 200,0 200,100 75,100' style='fill: url(#rg2);' /></svg>") no-repeat; -webkit-background-size: 100% auto; background-size: 100% auto; } </style> <body> </body> </html>
效果：
SVG參考手冊http://www.runoob.com/svg/svg-reference.html