javascript cookie 的使用

<input id="Button1" type="button" value="Set_Cookie" onclick="Set_Cookie( 'name', 'value', expires, '/', '', '' );"  />
<input id="Button2" type="button" value="Get_Cookie" onclick="Get_Cookie('name')" />
<input id="Button3" type="button" value="Delete_Cookie" onclick="Delete_Cookie('name');" />
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function Set_Cookie( name, value, expires, path, domain, secure )
    {
        // set time, it's in milliseconds
        var today = new Date();
        today.setTime( today.getTime() );
        /*
        if the expires variable is set, make the correct
        expires time, the current script below will set
        it for x number of days, to make it for hours,
        delete * 24, for minutes, delete * 60 * 24
        */
        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() : "" ) +
        ( ( path ) ? ";path=" + path : "" ) +
        ( ( domain ) ? ";domain=" + domain : "" ) +
        ( ( secure ) ? ";secure" : "" );
    }
function Get_Cookie(check_name)
    {
        var a_all_cookies = document.cookie.split(';');
        var a_temp_cookie = '';
        var cookie_name = '';
        var cookie_value = '';
        var b_cookie_found = false;
        for (i = 0; i < a_all_cookies.length; i++) {
            a_temp_cookie = a_all_cookies[i].split('=');
            cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');
            if (cookie_name == check_name) {
                b_cookie_found = true;
                if (a_temp_cookie.length > 1) {
                    cookie_value = unescape(a_temp_cookie[1].replace(/^\s+|\s+$/g, ''));
                }
                return cookie_value;
                break;
            }
            a_temp_cookie = null;
            cookie_name = '';
        }
        if (!b_cookie_found) {
            return null;
        }
    }
function Delete_Cookie(name)
    {
        var exp = new Date();
        exp.setTime(exp.getTime() - 1);
        var cval = Get_Cookie(name);
        if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
    }