javascript 操作cookie实例
<html><head><script type="text/javascript">function getCookie(c_name){if (document.cookie.length>0){c_start=document.cookie.indexOf(c_name + "=")if (c_start!=-1){c_start=c_start + c_name.length+1c_end=document.cookie.indexOf(";",c_start)if (c_end==-1) c_end=document.cookie.lengthreturn unescape(document.cookie.substring(c_start,c_end))}}return ""}function setSubmit(){ var userName = document.getElementById("userName").value; setCookie('username',userName,365) document.getElementById("info").innerText="成功设置了cookie，请刷新或重启浏览器";}function setCookie(c_name,value,expiredays){var exdate=new Date()exdate.setDate(exdate.getDate()+expiredays)document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString())}function checkCookie(){username=getCookie('username')if (username!=null && username!=""){ document.getElementById("userName").value=username;document.getElementById("password").focus();document.getElementById("info").innerText="发现cookie,你可以修改和删除cookie了";}else{document.getElementById("info").innerText="没有发现cookie,请输入用户名点提交";document.getElementById("userName").focus();}}function deleteCookie(){ document.getElementById("info").innerText="cookie被删除了"; var name="username";var date=new Date(); date.setTime(date.getTime()-10000); document.cookie=name+"=v; expire="+date.toGMTString(); }</script></head><body ><form name="myform" action="hml.jsp" method="get">用户名：<input type="text" id="userName"><br></br> 密码：<input type="password" id="password"><br></br><input type="button" id="button" value="提交" /><input type="button" id="button2"value="删除" /><div id="info"></div></form></body></html>
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