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JS限制Textarea文本域字符個數

<html>    
   <head>    
   <title>JS限制Textarea文本域字符個數</title>    
   <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />    
   <SCRIPT LANGUAGE="JavaScript">    
   <!--//    
   function textCounter(field, countfield, maxlimit) {    
   // 函數,3個參數,表單名字,表單域元素名,限制字符;    
   if (field.value.length > maxlimit)    
   //如果元素區字符數大於最大字符數,按照最大字符數截斷;    
   fieldfield.value = field.value.substring(0, maxlimit);    
   else    
   //在記數區文本框內顯示剩余的字符數;    
   countfield.value = maxlimit - field.value.length;    
   }    
   -->    
   </SCRIPT>    
   </head>    
   <body>    
    <form name=myform action="">    
        <textarea name="message" cols="28" rows="5" onKeyDown="textCounter(message,remLen,6);" onKeyUp=
"textCounter(message,remLen,6);"></textarea>    
        您還可以輸入:<input name="remLen" type="text" value="6" size="5" readonly="readonly">個字符    
    </form>    
   </body>    
   </html>
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