<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <meta name="robots" content="all" /> <meta name="author" content="" /> <meta name="Copyright" content="" /> <meta name="keywords" content="" /> <meta name="description" content="JS限制textarea输入框输入字数" /> <title>JS统计还可以输入多少字数，用于向输入者提示信息</title> <SCRIPT language="javascript"> <!-- function checktext(text) { allValid = true; for (i = 0; i < text.length; i++) { if (text.charAt(i) != " ") { allValid = false; break; } } return allValid; } function gbcount(message,total,used,remain) { var max; max = total.value; if (message.value.length > max) { message.value = message.value.substring(0,max); used.value = max; remain.value = 0; <!-- alert("留言不能超过 200 个字!");--> alert("不能超过"+total.value+"个字!"); } else { used.value = message.value.length; remain.value = max - used.value; } } --> </script> <style type="text/css"> <!-- * {padding:0; margin:0;} body, html {text-align:left; font-size:12px; line-height:150%; margin:0 auto; background:#fff; padding-top:20px;} fieldset {padding:10px; width:550px; margin:0 auto;} legend {font-size:14px; font-weight:bold;} .inputtext {border:none; background:#fff;} --> </style> </head> <body> <form action="SaveData.asp" method="post" > <fieldset><legend>请输入内容</legend> <textarea name="Memo" rows="10" wrap=PHYSICAL cols="75" onKeyDown="gbcount(this.form.Memo,this.form.total,this.form.used,this.form.remain);" onKeyUp="gbcount(this.form.Memo,this.form.total,this.form.used,this.form.remain);"></textarea> <p>最多字数： <input disabled maxLength="4" name="total" size="3" value="10" class="inputtext"> 已用字数： <input disabled maxLength="4" name="used" size="3" value="0" class="inputtext"> 剩余字数： <input disabled maxLength="4" name="remain" size="3" value="10" class="inputtext"></td> </p> </fieldset> </form> </body> </html>