javascript 操作Cookie

//获得coolie 的值

function cookie(name) {
    var cookieArray = document.cookie.split("; "); //得到分割的cookie名值对   

    var cookie = new Object();

    for (var i = 0; i < cookieArray.length; i++) {

        var arr = cookieArray[i].split("=");       //将名和值分开   

        if (arr[0] == name) return unescape(arr[1]); //如果是指定的cookie，则返回它的值   

    }

    return "";
}

function delCookie(name)//删除cookie
{
    document.cookie = name + "=;expires=" + (new Date(0)).toGMTString();
}


function getCookie(objName) {//获取指定名称的cookie的值

    var arrStr = document.cookie.split("; ");

    for (var i = 0; i < arrStr.length; i++) {

        var temp = arrStr[i].split("=");

        if (temp[0] == objName) return unescape(temp[1]);
    }
}

function addCookie(objName, objValue, objHours) {      //添加cookie

    var str = objName + "=" + escape(objValue);

    if (objHours > 0) {                               //为时不设定过期时间，浏览器关闭时cookie自动消失

        var date = new Date();

        var ms = objHours * 3600 * 1000;

        date.setTime(date.getTime() + ms);

        str += "; expires=" + date.toGMTString();

    } 
    
    document.cookie = str;
}

function SetCookie(name, value)//两个参数，一个是cookie的名子，一个是值
{
    var Days = 30; //此 cookie 将被保存 30 天

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

    if (arr != null) return unescape(arr[2]); return null;
}

function delCookie(name)//删除cookie
{
    var exp = new Date();

    exp.setTime(exp.getTime() - 1);

    var cval = getCookie(name);

    if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}