IFE_part2_JavaScript_BOM的学习

// BOM

// 判断是否为IE浏览器，返回-1或者版本号
function isIE() {
    var uUserAgent = navigator.userAgent; //保存浏览器的userAgent
    var ieAgent = uUserAgent.match(/msie (d+.d+)/i);
    if (ieAgent) {
        return ieAgent[1];
    } else {
        if (uUserAgent.match(/Trident/7.0;/i)) { //处理到ie11.
            ieAgent = uUserAgent.match(/rv:(d+.d+)/i);
            return ieAgent[1];
        }
        return -1; //不是ie浏览器。
    }
}

/**
 * 设置cookie
 * @param {String} cookieName  设置cookie名
 * @param {String} cookieValue 对对应的cookie名
 * @param {Number} expiredays  过期的时间(多少天后)
 */
function setCookie(cookieName, cookieValue, expiredays) {
    var oDate = new Date();
    oDate.setDate(oDate.getDate() + expiredays);
    document.cookie = cookieName + "=" + cookieValue + ";expires=" + oDate;
}

 /**
 * 获取cookie
 * @param   {String} cookieName 待寻找的cookie名
 * @returns {String} 返回寻找到的cookie值,无时为空
 */
function getCookie(cookieName) {
    var arr = document.cookie.split("; ");
    for (var i = 0; i < arr.length; i++) {
        var arr2 = arr[i].split("=");
        if (arr2[0] == cookieName) {
            return arr2[1];
        }
    }
    return "";
}

/**
 * 删除cookie
 * @param {String} cookieName 待删除的cookie名
 */
function removeCookie(cookieName) {
    setCookie(cookieName, "1", -1)
}