web存储方法，现成代码

function setCookie(cname,cvalue,exdays){ ???var d = new Date(); ???d.setTime(d.getTime()+(exdays*24*60*60*1000)); ???var expires = "expires="+d.toGMTString(); ???document.cookie = cname+"="+cvalue+"; "+expires;}function getCookie(cname){ ???var name = cname + "="; ???var ca = document.cookie.split(‘;‘); ???for(var i=0; i<ca.length; i++) { ???????var c = ca[i].trim(); ???????if (c.indexOf(name)==0) { return c.substring(name.length,c.length); } ???} ???return "";}function checkCookie(){ ???var user=getCookie("username"); ???if (user!=""){ ???????alert("欢迎 " + user + " 再次访问"); ???} ???else { ???????user = prompt("请输入你的名字:",""); ?????????if (user!="" && user!=null){ ???????????setCookie("username",user,30); ???????} ???}}

//保存数据 ?function save(){ ?????var site = new Object; ???site.keyname = document.getElementById("keyname").value; ???site.sitename = document.getElementById("sitename").value; ?????site.siteurl = document.getElementById("siteurl").value; ???var str = JSON.stringify(site); // 将对象转换为字符串 ???localStorage.setItem(site.keyname,str); ?????alert("保存成功");} ?//查找数据 ?function find(){ ?????var search_site = document.getElementById("search_site").value; ?????var str = localStorage.getItem(search_site); ?????var find_result = document.getElementById("find_result"); ???var site = JSON.parse(str); ?????find_result.innerHTML = search_site + "的网站名是：" + site.sitename + "，网址是：" + site.siteurl; ?}