cookie

function addCookie(name, value, expireHours) {
    var cookieString = name + "=" + (typeof value == 'string' ?  decodeURI(value.replace(/+/g, '%2B')) : value) + "; path=/";
    //判断是否设置过期时间
    if (expireHours > 0) {
        var date = new Date();
        date.setTime(date.getTime() + expireHours * 3600 * 1000);
        cookieString = cookieString + ";expires=" + date.toGMTString();
    }
    document.cookie = cookieString;
}

function getCookie(name) {
    var strcookie = document.cookie;
    var arrcookie = strcookie.split("; ");
    for (var i = 0; i < arrcookie.length; i++) {
        var arr = arrcookie[i].split("=");
        if (arr[0] == name){
            return unescape(arr[1]); 
        }
    }
    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 + "; path=/;expires=" + exp.toGMTString();
}