Post.htm

<input type="text" name="txt1">  
<input type="button" value="Post">  
<script language="javascript" >  
function setCookie(name,value)  
{  
/*  
*--------------- setCookie(name,value) -----------------  
* setCookie(name,value)  
* 功能:设置得变量name的值  
* 参数:name,字符串;value,字符串.  
* 实例:setCookie('username','baobao')  
*--------------- setCookie(name,value) -----------------  
*/  
var Days = 30; //此 cookie 将被保存 30 天  
　　var exp　= new Date();  
exp.setTime(exp.getTime() + Days*24*60*60*1000);  
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  
location.href = "Read.htm"; //接收页面.  
}  
</script>  

Read.htm

<script language="javascript" >  
function getCookie(name)  
{  
/*  
*--------------- getCookie(name) -----------------  
* getCookie(name)  
* 功能:取得变量name的值  
* 参数:name,字符串.  
* 实例:alert(getCookie("baobao"));  
*--------------- getCookie(name) -----------------  
*/  
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));  
if(arr !=null) return unescape(arr[2]); return null;  
}  
alert(getCookie("baobao"));  
</script>