Html弹窗利用Cookie控制弹窗24小时只显示一次

window.onload = function () {  
        //================  
        var s = document.cookie;  
        if (s.indexOf('myad=1') != -1) return; //存在cookie退出下面代码的执行  
        var d = new Date();  
        d.setHours(d.getHours() + 24); //有效期24小时  
        document.cookie = 'myad=1;expires='+d.toGMTString();//设置cookie  
        //================  
        /*自己弹窗代码*/  
    }  

$(document).ready(function(){         
    showSuspend();        
});  
  
  
  
function setCookie(cookiename, value, expire)    
{    
    window.document.cookie = cookiename + "=" + escape(value)   
        + ((expire == null) ? "" : ("; expires=" + expire.toGMTString())) + ";path=/";;    
}     
  
function getCookie(cookiename)    
{    
    var search = cookiename + "=";    
    if (window.document.cookie.length > 0)    
    {   
        offset = window.document.cookie.indexOf(search);    
        if (offset != -1)    
        {  
            offset += search.length;    
            end = window.document.cookie.indexOf(";", offset)    
          
          if (end == -1)    
             end = window.document.cookie.length;    
          return  
             unescape(window.document.cookie.substring(offset, end));    
        }    
    }    
    return "";    
}    
  
var end = new Date('2015-09-03 23:59:59');  
function register(cookiename) {    
    setCookie("zhezhao", cookiename, end);    
}    
  
  
function showSuspend() {    
    if(new Date().getTime() < end.getTime()){  
        var c = getCookie("zhezhao");    
        if (c != null && c != "") {    
          return;    
        }    
        register("93");    
        $("#zhezhaoDiv").show();  
    }  
      
}