用 Javascript 操作 Cookie

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 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 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';

}