js计算字数

<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>
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js计算字数

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