实现本地SVG和图片下载

Ver 1.0

支持：IE10+, Chrome32+, Firefox49+, Safari7+

依赖：

• atob
• canvas-toBlob.js
• canvg
• FileSaver.js

用法：

<script type="text/javascript" src="./canvas-toBlob/canvas-toBlob.js"></script> 
<script type="text/javascript" src="./canvg/rgbcolor.js"></script> 
<script type="text/javascript" src="./canvg/StackBlur.js"></script>
<script type="text/javascript" src="./canvg/canvg.js"></script> 
<script type="text/javascript" src="./FileSaver/FileSaver.js"></script> 
<script type="text/javascript" src="./DownloadCanvas.js"></script> 

DownloadCanvas({
	canvas: null, // canvas对象可选
	data: null, // img或svg的对象或base64
	type: 'png', // 下载类型
	filename: 'canvas_' + (new Date()).getTime(), //下载文件名称
	width: null, // 宽
	height: null // 高
});

MIT