此目录是canvas练习的demo
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|____ball-animation 球的运动demo
| |____ball1.html 单个小球滚动
| |____ball2.html 多个小球滚动
|____charts canvas绘制图表demo
| |____charts.html 柱状图，适配H5的分辨率
|____hand-writting imooc学写一个字demo
| |____index.css
| |____index.html
| |____index.js
|____README.md