cookie的存储

　　储存cookie

function setMyCookie(c_name, value) {
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + 60 * 2000); //过期时间 2分钟  
    document.cookie = c_name + "=" + escape(value) + ";expires=" + exp.toGMTString() + ";path=/";
}

　　删除cookie

function getMyCookie(c_name) {
    if(document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=")
        if(c_start != -1) {
            c_start = c_start + c_name.length + 1
            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))
        }
    }
    return "";
}