About cookies need to set path and cookie domain

Today encountered a small problem, in the invocation of the cookie, Document.cookie = ", Baidu found that because I set the cookie is not set the path of the cookie, so only in the current directory page access to cookies, I want the cookie to be accessible at the parent or even all pages, I must set the path of the cookie, PATH =/. New Encapsulated Cookie:

Set Cookie,name is the name to be saved, value is the corresponding value, Iday is the expiration
function Setcookie (name,value,iday,path) {
    //Use Date Object
    var Odate = new Date ();
    Set Expiration Time
    odate.setdate (odate.getdate () + iday);
    Set the cookie
    document.  = name + ' = ' + value + '; expires= ' + Odate + '; Path= ' + path;
}
Invoke the cookie for subsequent operation
function GetCookie (name) {
    //split cookie becomes array
    document.  Cookies. Split ('; ');
    for (var i = 0; i < arr.length; i++) {
        //continue to split Name=value
        var arr2 = arr[i].  Split(' = ');
        if (arr2[0] = = name) {
            return arr2[1]
        }
    }
    return '
}
//delete cookie
function Removecookie (name) {
    //Set cookie expiry time to-1
    setcookie (name, 1,-1)
}

This makes it possible to access cookies on all pages.