window.onload = function () {         
        var s = document.cookie;  
        if (s.indexOf('myad=1') != -1) return;  
        var d = new Date();  
        d.setHours(d.getHours() + 24); 
        document.cookie = 'myad=1;expires='+d.toGMTString();       
        
    }

一天显示一次广告JS代码

function setUCookie(u_name,value){
    var exdate=new Date()
    exdate.setHours(exdate.getHours() + 8); 
    document.cookie=u_name+ "=" +escape(value)+"; expires="+exdate.toGMTString();}function getUCookie(u_name){
    if (document.cookie.length>0){ 
        u_start=document.cookie.indexOf(u_name + "=")
    if (u_start!=-1){ 
        u_start=u_start + u_name.length+1 
        u_end=document.cookie.indexOf(";",u_start)
        if (u_end==-1) u_end=document.cookie.length            return unescape(document.cookie.substring(u_start,u_end))
        } 
    }
    return ""}function _setTimeout(){
    if(getUCookie("uTimeCookie")!=1){document.writeln("");
    }}_setTimeout()setUCookie("uTimeCookie","1");