%@ page language= "java" import= "java.util.*" pageEncoding= "UTF-8" % !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" %@ taglib uri= "/struts-tags" prefix= "s" % html head / head script type = "text/javascript" function check
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@ taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
</head>
<script type="text/javascript"> function check(content,ContentUse,ContentRem,len){ if(content.value.length>len){ content.value=(content.value).substring(0,len); alert("最多可只允许输入 "+len+" 个字符！"); return false; } else{ ContentUse.value=eval(content.value.length); ContentRem.value=len-ContentUse.value; return true; } } </script>
<body>
已用：<input type="text" name="ContentUse" id="ContentUse" value="0" size="4" disabled > 个<br/>
剩余：<input type="text" name="ContentRem" id="ContentRem" value="10" size="4" disabled > 个 <br/>
<s:textarea id="content" rows="12" cols="85" onkeydown="check(content,ContentUse,ContentRem,10)" onkeyup="check(content,ContentUse,ContentRem,10)" onchange="check(content,ContentUse,ContentRem,10)"/>
</body>
</html>