/**

 * @desc  设置Cookie

 * @param {String} name

 * @param {String} value

 * @param {Number} expires

 */

function setCookie(name, value, expires) {

    var cookieString = name + "=" + escape(value);

    //判斷是否設置過期時間,0代表關閉瀏覽器時失效

    if (expires > 0) {

        var date = new Date();

        date.setTime(date.getTime() + expires * 1000);

        cookieString = cookieString + ";expires=" + date.toUTCString();

    }

    document.cookie=cookieString;

}

/**

 * @desc 根据name读取cookie

 * @param  {String} name

 * @return {String}

 */

function getCookie(name) {

    var arr = document.cookie.replace(/\s/g, "").split(';');

    for (var i = 0; i < arr.length; i++) {

        var tempArr = arr[i].split('=');

        if (tempArr[0] == name) {

            return decodeURIComponent(tempArr[1]);

        }

    }

    return '';

}

/**

 * @desc 根据name修改cookie

 * @param  {String} name

 * @param  {String} value

 * @param  {Number} expires

 */

function editCookie(name, value, expires){

    var cookieString = name + "=" + escape(value);

    if (expires > 0) {

        var date = new Date();

        date.setTime(date.getTime() + expires * 1000);

        cookieString = cookieString + ";expires=" + date.toGMTString();

    }

    document.cookie = cookieString;

}

/**

 * @desc 根据name删除cookie

 * @param  {String} name

 */

function removeCookie(name) {

    // 设置已过期，系统会立刻删除cookie

    setCookie(name, '1', -1);

}