Js设置及获取Cookie的方法

<script type="text/javascript">

if(json.result=="true")
{
if($("input[type='checkbox']").is(':checked'))
{setCookie('sapid',json.zstaff_id,30)}
else
{setCookie('sapid',json.zstaff_id,0.05)/*1小时后过期*/}
alert("登陆成功");
/*登陆成功后定向到主页*/
window.location.href = "index.html";
}
else
{alert("账号或密码错误，登陆失败！");}

//设置Cookie
function setCookie(cname, cvalue,cdate) {
var exdays=cdate;
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+d.toUTCString();
document.cookie = cname + "=" + cvalue + "; " + expires;
}
</script>

<script type="text/javascript">
$(document).ready(function(){
/*未加载成功时不显示*/
var userid = getCookie("sapid");
if (userid == "") {
$(".alertDiv_hint").html("<p>您无权浏览该页面，请登陆后再试！</p>");
$(".alertDiv").show();
setTimeout("location.href='login.html'",1000);
}
});
//获取cookie
function getCookie(cname) {
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1);
if (c.indexOf(name) != -1) return c.substring(name.length, c.length);
}
return "";
}
//清除cookie
function delCookie(name){
var date = new Date();
date.setTime(date.getTime() - 10000);
document.cookie = name + "=a; expires=" + date.toGMTString();
}
</script>