js操作cookie

function SetCookie(name, value) {
var Days = 1;//保留天数
var exp = new Date();
exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString() + ";path=/;";
}
function GetCookie(name) {
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
if (arr != null) return unescape(arr[2]); return null;
}
function DelCookie(name) {
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval = GetCookie(name);
if (cval != null) document.cookie = name + "=" + escape(cval) + ";expires=" + exp.toGMTString() + ";path=/;";
}