cookie 设置二级域名共享cookie

好吧，无聊的时候就发下博客，记录最近的心得 

核心代码

document.cookie = sName + "=" + escape(sValue) + ";domain=.abc.com; expires=Fri, 31 Dec 2016 23:59:59 GMT; path=/"

完整代码

<script language="javascript" type="text/javascript">
function SetCookie(sName, sValue)
{
var a=sValue;
document.cookie = sName + "=" + escape(sValue) + ";domain=.abc.com; expires=Fri, 31 Dec 2016 23:59:59 GMT; path=/"
}
function GetCookie(sName)
{
var aCookie = document.cookie.split("; ");
for (var i=0; i < aCookie.length; i++)
{
var aCrumb = aCookie[i].split("=");
if (sName == aCrumb[0])
return unescape(aCrumb[1]);
}
return 0;
}
function DelCookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=GetCookie(name);
if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}
function changeWindow(){
var widthh = document.body.clientWidth;
if(widthh < 1002){
document.getElementById("mybody").className='width1002';
}
}
</script>

效果，所有abc.com的二级域名均可以实现共享cookie，可以做一些登录相关的事情