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<!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=utf-8" />
<title>无标题文档</title>
<style>
* {margin:0;padding:0;font-size:14px; font-family:"微软雅黑";}
ul,li {list-style:none;}
</style>
</head>
<body>
<table width="985" align="center" cellpadding="0" cellspacing="30" style="margin:20px auto;border:1px solid #F69;" id="text">
<tr>
<td height="480" valign="top">
<table width="900" cellpadding="0" cellspacing="0" id="display">
<tr>
<td>小小骑士:谁在线??</td>
</tr>
<tr>
<td>小小骑士:觉得这个怎么样啊??</td>
</tr>
<tr>
<td>小小骑士:还不错了??</td>
</tr>
<tr>
<td>小小骑士:是吗?呵呵.....</td>
</tr>
<tr>
<td>小小骑士:真的不错,学习了!哈哈....</td>
</tr>
</table>
</td>
</tr>
<tr>
<td height="40"><input type="text" value="小小骑士" id="username" style="width:80px;text-align:center;" /> : <input type="text" id="usertext" style="width:500px;margin:0 10px 0 0;" maxlength="200" value="12" /> <input type="button" style="width:80px;" value="发送" id="usersubmit" /></td>
</tr>
</table>
<script>
var btn = document.getElementById('usersubmit');
var msg = document.getElementById('usertext');
var id = document.getElementById('display');
var user = document.getElementById('username');
var reg = /^\s*(\S+)\s*$/ ; //匹配 空格
btn.onclick = function(){
if( reg.test(msg.value) == "" ) {alert('请输入内容');return false};
id.insertRow(-1).insertCell(0).innerHTML = user.value + ":" + msg.value ;
msg.value = "" ;
msg.focus();
}
</script>
</body>
</html>
<input type="text" autocomplete=off/>
<form autocomplete=false >