4.className用法 例 4.1(keyIEFF.html) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <title> </title> <script language="JavaScript" type="text/javascript"> function calc(thistextar, Span) { var len = thistextar.value.length; Span.innerHTML = len + ' 字'; Span.className = 'toredC'; } </script> <style type="text/css"> <!-- .toredC { color: #FF0000; } --> </style> </head> <body><textarea cols="50" rows="3" onKeyUp="calc(this,document.getElementById('num'))" ></textarea> (<SPAN id=num>字数</SPAN>) </body> </html>
更多请见:https://blog.csdn.net/qq_43650923/article/details/102822703
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