<div class="htmlarea"> <textarea id="runcode45273"> <title>无标题页</title> <script language="javascript" type="text/javascript"> var a = 0.123456789; document.write(a.toPrecision(3)); </script> </textarea><br><input onclick="runEx('runcode45273')" type="button" value="运行代码"> <input onclick="doCopy('runcode45273')" type="button" value="复制代码"> <input onclick="doSave(runcode45273)" type="button" value="保存代码">[Ctrl+A 全选 注:<a href="http://www.jb51.net/article/23421.htm" title="查看具体详情" target="_blank">如需引入外部Js需刷新才能执行</a>]</div>
