签名框（Textarea）限制文字数量并适时提示

(编辑：jimmy 日期: 2025/9/24 浏览：2)

当输入的字符达到限制后，就不能再输入了，你输入一个，会被程序删除一个，有意思吧？

<title>文本框输入限制</title> <textarea onkeyup='value=value.substr(0,10);this.nextSibling.innerHTML=value.length+"/10";'><"runEx('runcode27515')" type="button" value="运行代码" class="fn-butt" /> <INPUT onclick="copy2('runcode27515')" type="button" value="复制代码" class="fn-butt" /> <INPUT onclick="doSave(runcode27515)" type="button" value="保存代码" class="fn-butt" />[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]</div>
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