//判断是否存在名为aaa的cookie

function hasSetCookie(name){

    var strCookie = document.cookie;

    var arrCookie = strCookie.split("; ");

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

        var arr = arrCookie[i].split("=");

        if (arr[0] == name) {

            return true;

        }

    };

    return false;

}

//添加cookie  判断是否设置过期时间,expiresHours=0代表关闭浏览器时失效

function addCookie(name, value, expiresHours) {

    var cookieString = name + "=" + escape(value); //escape() 函数可对字符串进行编码，这样就可以在所有的计算机上读取该字符串。

    if (expiresHours > 0) {

        var date = new Date();

        date.setTime(date.getTime() + expiresHours *3600* 1000);

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

    }

    document.cookie = cookieString;

}

//修改cookie  判断是否设置过期时间,expiresHours=0代表关闭浏览器时失效

function editCookie(name, value, expiresHours) {

    var cookieString = name + "=" + escape(value); //escape() 函数可对字符串进行编码，这样就可以在所有的计算机上读取该字符串。

    if (expiresHours > 0) {

        var date = new Date();

        date.setTime(date.getTime() + expiresHours *3600* 1000);

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

    }

    document.cookie = cookieString;

}

//根据名字获取cookie的值

function getCookie(name) {

    var strCookie = document.cookie;

    var arrCookie = strCookie.split("; ");

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

        var arr = arrCookie[i].split("=");

        if (arr[0] == name) {

            return unescape(arr[1]);

            break;

        } else {

            continue;

        };

    };

}

//删除cookie

function deleteCookie(name){

    var date=new Date();

    date.setTime(date.getTime()-10000);

    document.cookie=name+"=v; expires="+date.toUTCString();

}