something functions about tools/algorithm
给定倒计时时间，返回天时分秒值。
定义和实现遍历树结构数据类，实现查找指定数据，获取指定数据层级路径以及插入和删除子数据。
实现html文件抽象语法树（ast），将html结构文件转换为对应层级的json数据，可以修改数据并生成新的html文件。
其中$on方法可以监听标签打开和关闭事件，并接受回调函数处理自定义逻辑。
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React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
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An Open Source Machine Learning Framework for Everyone
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The Web framework for perfectionists with deadlines.
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A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
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We are working to build community through open source technology. NB: members must have two-factor auth.
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Google ❤️ Open Source for everyone.
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Alibaba Open Source for everyone
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Data-Driven Documents codes.
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China tencent open source team.