js Cookie用法

//写cookies

function setCookie(name, value) {

    var Days = 30;

    var exp = new Date();

    exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);

    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();

}

//读取cookies

function getCookie(name) {

    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");

    if (arr = document.cookie.match(reg))

        return unescape(arr[2]);

    else

        return null;

}

//删除cookies

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();

}