使用Javascript设置，获取和删除cookie详解编程语言

function setCookie (name, value, expires, path, domain, secure){ 
    var today = new Date(); 
    today.setTime(today.getTime()); 
    if (expires){ 
      expires = expires * 1000 * 60 * 60 * 24; 
    } 
    var expires_date = new Date( today.getTime() + (expires)); 
    document.cookie = name+'='+escape( value ) + 
        ((expires) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString() 
        ((path) ? ';path=' + path : '' ) + 
        ((domain) ? ';domain=' + domain : '' ) + 
        ((secure) ? ';secure' : '' ); 
} 
 
function getCookie(name){ 
    var start = document.cookie.indexOf( name + "=" ); 
    var len = start + name.length + 1; 
    if ((!start) && (name != document.cookie.substring( 0, name.length))){ 
      return null; 
    } 
    if (start == -1) return null; 
    var end = document.cookie.indexOf(';', len); 
    if (end == -1) end = document.cookie.length; 
    return unescape(document.cookie.substring(len, end)); 
} 
 
function deleteCookie (name, path, domain){ 
    if (getCookie(name)) document.cookie = name + '=' + 
        ((path) ? ';path=' + path : '') + 
        ((domain) ? ';domain=' + domain : '' ) + 
        ';expires=Thu, 01-Jan-1970 00:00:01 GMT'; 
}