前端设置用户设置，获取，清空Cookie setCookie,getCookie,clearCookie

直接贴代码

function setCookie(name, value, seconds) {
    seconds = seconds || 0;   //seconds有值就直接赋值，没有为0
    var expires = "";
    if (seconds != 0) {      //设置cookie生存时间
        var date = new Date();
        date.setTime(date.getTime() + (seconds * 1000));
        expires = "; expires=" + date.toGMTString();
    }
    document.cookie = name + "=" + escape(value) + expires + "; path=/";   //转码并赋值
}

function getCookie(c_name) {
    if (document.cookie.length > 0) {
        var c_start = document.cookie.indexOf(c_name + "=")
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1
            var c_end = document.cookie.indexOf(";", c_start)
            if (c_end == -1) c_end = document.cookie.length
            return unescape(document.cookie.substring(c_start, c_end)).replace(/\"/g, "");
        }
    }
    return null;
}

function clearCookie(name) {
    setCookie(name, "", -1);
}