<!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=gb2312" />
<title>文本框输入字数统计示例</title>
</head>
<style type="text/css">
body{
font-size:12px;}
</style>
<script language="JavaScript">
<!--
function gbcount(){
var max=50;
var content = document.getElementById("content");
var used = document.getElementById("used");
var remain = document.getElementById("remain");
if(content.value.length > max){
content.value = content.value.substring(0,max);
used.innerHTML = max;
remain.innerHTML = 0;
alert("最多只能输入100字！");
}else{
used.innerHTML = content.value.length;
remain.innerHTML = max - content.value.length;
}
}
//-->
</script>
<body>
<form action="" method="post">
<table border="1" style="border-collapse:collapse">
<tr>
<td colspan="2" align="center">输入字数统计示例</td>
</tr>
<tr>
<td>内容：</td>
<td>
<textarea id="content" name="content" cols="60" rows="6" οnkeydοwn="gbcount();" οnkeyup="gbcount();"></textarea>
</td>
</tr>
<tr>
<td>提示信息：</td>
<td>
请勿超过<span id="total" style="color:#FF0000">100</span>字，
您已经输入了<span id="used" style="color:#FF0000">0</span>字，
还可以继续输入<span id="remain" style="color:#FF0000">100</span>字。
</td>
</tr>
</table>
</form>
</body>
</html>
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08-09
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