使用javascript讀取Cookie值 – JQuery Cookie的用法

jQuery cookie是個很好的cookie外掛程式，大概的使用方法如下

代碼

example $.cookie(’name’, ‘value’);
設定cookie的值，把name變數的值設為value
example $.cookie(’name’, ‘value’, {expires: 7, path: ‘/’, domain: ‘jquery.com’, secure: true});
建立一個cookie 包括有效期間 路徑 網域名稱等
example $.cookie(’name’, ‘value’);
建立cookie
example $.cookie(’name’, null);
刪除一個cookie
var account= $.cookie('name');
取一個cookie(name)值給myvar

 

jQuery cookie外掛程式源碼如下：

jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') { // name and value given, set cookie
        options = options || {};
if (value === null) {
            value = '';
            options.expires = -1;
        }
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
var path = options.path ? '; path=' + options.path : '';
var domain = options.domain ? '; domain=' + options.domain : '';
var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    } else { // only name given, get cookie
        var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
                if (cookie.substring(0, name.length + 1) == (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
                }
            }
        }
return cookieValue;
    }
};