1、SVG介绍
<!--SVG指可伸缩矢量图形(Scaleble Vector Graphics)-->
<!--SVG用来定义用于网格的基于矢量的图形-->
<!--SVG使用XML格式定义图形-->
<!--SVG图像在放大或者改变尺寸的情况下其图形质量不会有损失-->
<!--SVG是万维网联盟的标准-->
2、SVG绘制矢量图形
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>绘制矢量图形</title>
</head>
<body>
<svg width="120" height="120" viewBox="0 0 120 120"
xmlns="http://www.w3.org/2000/svg">
<ellipse cx="60" cy="60" rx="50" ry="25"/>
</svg>
<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="feOffset" x="-40" y="-20" width="100" height="200">
<feOffset in="SourceGraphic" dx="60" dy="60" />
</filter>
</defs>
<rect x="40" y="40" width="100" height="100"
style= "stroke : #000000; fill: green; filter: url(#feOffset);" />
<rect x="40" y="40" width="100" height="100"
style= "stroke : #000000; fill: green; " />
</svg>
<svg width="120" height="120" viewPort="0 0 120 120" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<rect x="10" y="10" width="100" height="100">
<animate attributeType="XML" attributeName="x" from="-100" to="120"
dur="10s" repeatCount="indefinite"/>
</rect>
</svg>
</body>
</html>
3、引入外部SVG图片
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<iframe src="svg.svg" frameborder="no" width="400" height="200"></iframe>
</body>
</html>
<?xml version="1.1"?>
<svg viewBox="0 0 1000 300"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<path id="MyPath"
d="M 100 200
C 200 100 300 0 400 100
C 500 200 600 300 700 200
C 800 100 900 100 900 100" />
</defs>
<use xlink:href="#MyPath" fill="none" stroke="red" />
<text font-family="Verdana" font-size="42.5">
<textPath xlink:href="#MyPath">
ELLOWORLD 20170203 ELLOWORLD HAHAHAHA
</textPath>
</text>
<!-- Show outline of the viewport using 'rect' element -->
<rect x="1" y="1" width="998" height="298"
fill="none" stroke="black" stroke-width="2" />
</svg>