一个基于canvas实现的富文本编辑器demo，仅仅是demo。
Home Page: https://wanglin2.github.io/canvas-editor-demo/
支持编辑纯文本，支持设置字体、字号、颜色、背景颜色、删除线、下划线、行高。
支持输入、删除、回车
支持选区，选区支持删除和替换
实现原理可参考文章：如何用canvas实现一个富文本编辑器。
因为代码编辑器的一些功能同样word也是有需要的。比如：折叠功能、提示补全。顺带手地，未来的word中也有需要排版代码并美化之的需求，于是，第一时间就很方便地支持了。
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