弹窗代码

<script>
var alertmessage="欢迎来到爱巧遇导航，点击右上角关注公众号，防迷路！"
var once_per_session=1
function get_cookie(Name) {
 var search = Name + "="
 var returnvalue = "";
 if (document.cookie.length > 0) {
   offset = document.cookie.indexOf(search)
   if (offset != -1) { // if cookie exists
     offset += search.length
     end = document.cookie.indexOf(";", offset);
     if (end == -1)
        end = document.cookie.length;
     returnvalue=unescape(document.cookie.substring(offset, end))
     }
  }
 return returnvalue;
}

function alertornot(){
if (get_cookie('alerted')==''){
loadalert()
document.cookie="alerted=yes"
}
}

function loadalert(){
alert(alertmessage)
}

if (once_per_session==0)
loadalert()
else
alertornot()
</script>