发布日期：2017-12-04 21:10:13
一段SVG代码开始SVG的学习
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这段SVG最终会画出一个时钟。
这段SVG代码一般都能看个大概，但深入进去就有很多细节需要学习了解一下：
1. <SVG>的viewbox属性viewBox="50 50 400 500"怎么理解？
2.<path>的绘画方法(语法)是什么？怎么理解：https://developer.mozilla.org/zh-CN/docs/Web/SVG/Tutorial/Paths
3.本例<path>中的数据看起来就不是人为算出来的，（不然那工作量该多大啊，还有这么多小数点）。于是发现原来可以通过一些制图软件画好图片后再导出SVG格式，这样就简单了。adobe是专业的。
4.<g><circle><line><text><rect><polygon>各个元素代表的图形和属性。