JS开发通过设置cookie实现第一次进入首页展示弹窗广告，再次进入隐藏广告

<div class="dn car-activity-opcity"></div>

<div class="dn car-activity-module">

<a href="javascript:var bd_close;" class="close-activity" title="关闭" id="T-close-chezhujie" otitle="关闭-车主节首页弹窗" otype="button">关闭</a>

<a href="http://www.xxx.com/huiyuan/2016czj.shtml" class="car-activity-link-a" title="立即参与" id="T-lijicanyu" otitle="立即参与-车主节" otype="button" id="T-lijicanyu">立即参与</a>

<a href="http://www.xxx.com/cpchexian/campaign/zhitong/201601.shtml" class="car-activity-link-b" title="享车险福利" otitle="享车险福利-车主节" otype="button" target="_blank" id="T-xiangchexianfuli">享车险福利</a>

<a href="http://www.xxx.com/cpbaoxian/official/chezhujiehd/index.shtml" class="car-activity-link-c" title="享其他福利" otitle="享其他福利-车主节" otype="button" target="_blank" id="T-xiangqitafuli">享其他福利</a>

</div>

<script type="text/javascript">

$(".car-activity-module .close-activity").click(function(){

$(".car-activity-opcity").fadeOut();

$(".car-activity-module").fadeOut();

});

if(getCookieValue("carPopUp")!="ed"){

$(".car-activity-opcity").show();

$(".car-activity-module").show();

setCookie("carPopUp","ed",30,"/");

}

function setCookie(name,value,days,path){

var name = escape(name);

var value = escape(value);

var expires = new Date();

expires.setTime(expires.getTime() + days * 24*60*60*1000);

path = path =="" ? "":";path=" + path;

_expires = (typeof days) == "string" ? "": ";expires=" + expires.toUTCString();

// document.cookie = name + "=" + value + _expires + path;

document.cookie = name + "=" + value + path;

}

function getCookieValue(name){

var name = escape(name);

var allcookies = document.cookie;

name += "=";

var pos = allcookies.indexOf(name);

if(pos != -1){

var start = pos + name.length;

var end = allcookies.indexOf(";",start);

if(end == -1){

end = allcookies.length;

}

var value = allcookies.substring(start,end);

return unescape(value);

} else{

return "";

}

}

</script>