js操作cookies

function setCookie(name, value) {
    var Days = 30;
    var exp = new Date(); //new Date(“December 31, 9998″);
    exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
    document.cookie = name + “ = ” + escape(value) + “;
    expires = ” + exp.toGMTString();
}
function getCookie(name) {
    var arr, reg = new RegExp(“ ( ^ |)” + name + ” = ([ ^ ;] * )(; | $)”);
    if (arr = document.cookie.match(reg)) return unescape(arr[2]);
    else return null;
}
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();
}