js对cookie的写入，读取及删除

/*

name:cookie 名

value:cookie 值

*/

//写入cookie

function 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();

}

///删除cookie

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();

}

//读取cookie

function getCookie(name)

{

var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));

if(arr != null)

return unescape(arr[2]);

return null;

}