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自己用textarea实现一个markdown编辑器，没有tab缩进快捷键，请问如何添加
闭关修行中......
写onkeydown函数，当keyCode == 9的时候在textarea的value后面添加四个空格。
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写onkeydown函数，当keyCode == 9的时候在textarea的value后面添加四个空格。