特点:
1、不依赖jQuery等任何框架或者内库
2、原生javascript
3、使用外链
4、JS文件已经存储在CDN上，可以直接使用，支持ssl协议外链，github的外链
【引用代码】
1.<script type="text/javascript" src="https://cdn.bootcss.com/canvas-nest.js/1.0.1/canvas-nest.min.js"></script>
【JS代码】
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