1：什么是svg?
百度文科是这样说的？
svg初体验：
css
.svg{ width:100px; height:100px; background:url(regint.svg); background-repeat: no-repeat; }
html
<body> <div class="svg"></div> </body>
svg
<svg width="640" height="480" xmlns="http://www.w3.org/2000/svg"> <!-- Created with SVG-edit - http://svg-edit.googlecode.com/ --> <defs> <radialGradient id="svg_1" cx="0.41" cy="0.34" r="0.53" fx="0.1" fy="0.1"> <stop offset="0" stop-color="#7b9af7"/> <stop offset="1" stop-color="#cde0f4"/> </radialGradient> </defs> <g> <title>Layer 1</title> <rect fill="url(#svg_1)" stroke="#000000" stroke-width="0" x="112" y="112" width="425" height="214" id="svg_2"/> </g> </svg>
实现的效果