有没有一种方法可以使HTML文本区域元素只允许一行？
我之所以想这样做，是因为我会有一个按钮来展开它，但如果允许用户在文本区域未展开时输入多行（只有一行），这看起来就不太好了，如果我使用文本框来表示未展开状态，那么当我将其替换为文本区域并用动画展开时，这看起来很奇怪。
您可以使用jQuery来创建这样的字段效果请参阅此处的演示。
http://www.9lessons.info/2010/03/facebook-like-expanding-textbox-with.html
据我所知，您需要使用javascript来监控和阻止回车键。
然而，不是在纯HTML中，如果您使用JavaScript，您就可以做到这一点。
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