CSS+JS+Cookie实现页脚固定广告展示(支持关闭、一段

<div class="float_mask" id="float_mask">
<div class="float_layer">
</div>
<div class="float_content clearfix">
<div class="float_bg">
<a target="_blank" href="<a href="https://.jb51./">https://.jb51./</a>" title='广告部分'>
<div class="float_slogan"><!--广告内容--></div>
</a>
</div>
<div class="float_close">
<a onclick="closeFootAd()" href="#" title="我知道了"></a>
</div>
</div>
</div>

.float_mask{position: fixed;z-index: 19999;display:none;width: 100%;right: 0; bottom: 0;height: 105px;_bottom: auto;_width: 100%;_position: absolute;
_: expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,10)||0)-(parseInt(this.currentStyle.marginBottom,10)||0)));}
.float_layer{position: absolute;left: 0;: 0;z-index: 1;width: 100%;height: 100%;background: #071828;filter: alpha(opacity=80);opacity: 0.80;}
.float_content{ position: relative;z-index: 2;width: 1005px;height: 100%;margin: 0 auto;padding-left: 70px;}
.float_bg, .float_close{ float: left;}
.float_bg{position: relative;width: 820px;height: 135px;margin-: -27px;}
.float_slogan {position: absolute; background: url("footer_ad.png") 0 0 no-repeat;}
.float_slogan{left: 0;bottom: 0;width: 800px;height: 135px;cursor: pointer;}
.float_close{width: 60px;margin-: 30px;}
.float_close a {display: block;width: 53px; height: 52px; margin-left: 7px; background: url("close.png") 0 0 no-repeat;-webkit-transition: all 400ms;}

window.onload = function(){
if(getCookie("footad")==0){
document.getElementById("float_mask").style.display="none";
}else{
document.getElementById("float_mask").style.display="block";
}
}
//关闭底部广告
function closeFootAd() {
document.getElementById("float_mask").style.display="none";
setCookie("footad","0");
}

//设置cookie
function setCookie(name,value){
var exp = new Date();
exp.setTime(exp.getTime() + 160601000);//有效期1小时
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
//取cookies函数
function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;])(;|$)"));
if(arr != null) return unescape(arr[2]); return null;
}