用JavaScript限制textarea输入长度 (For: IE、Firefox ...)[

(编辑：jimmy 日期: 2026/3/8 浏览：3 次 )

<!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" lang="gb2312"> <head> <head> <title> Code：用JavaScript限制textarea输入长度 (For: IE、Firefox ...)</title> <meta http-equiv="content-type" content="text/html; charset=gb2312" /> <meta name="author" content="枫岩,CNLei.y.l@gmail.com"> <meta name="keywords" content="textarea,输入长度" /> <meta name="description" content="用JavaScript限制textarea输入长度 (For: IE、Firefox ...)" /> <style type="text/css" media="all"> body {font-size:14px;} </style> </head> <body> maxlength=10 <textarea maxlength="10" onkeyup="return isMaxLen(this)"><"20" onkeyup="return isMaxLen(this)"><"text/javascript"> function isMaxLen(o){ var nMaxLen=o.getAttribute? parseInt(o.getAttribute("maxlength")):""; if(o.getAttribute && o.value.length>nMaxLen){ o.value=o.value.substring(0,nMaxLen) } } </script> </body> </html>
[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

上一篇：检测邮箱地址是否合法 Check Mail Address (For: IE5+、FF1.06、Opera 7+ ...)[
下一篇：获取任意Html元素与body之间的偏移距离 offsetTop、offsetLeft （For:IE5＋ FF1 ）[