复制代码 代码如下:
function jb51tuitan(){
if (getcookie('jb51popped')==''){
//要执行的代码或一些操作
setcookie(jb51popped,ok); //写入cookies表示已经执行过了。 
alert(ok);
}
}
jb51tuitan()
function setcookie(name, value)    
{
    var argv = setcookie.arguments;
    var argc = setcookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    if(expires!=null)
    {
        var largeexpdate = new date ();
        largeexpdate.settime(largeexpdate.gettime() + (expires*1000*3600*24));
    }
    document.cookie = name + = + escape (value)+((expires == null) ? : (; expires= +largeexpdate.togmtstring()));
}
function getcookie(name)
{
    var search = name + =
    if(document.cookie.length > 0)
    {
        offset = document.cookie.indexof(search)
        if(offset != -1)
        {
            offset += search.length
            end = document.cookie.indexof(;, offset)
            if(end == -1) end = document.cookie.length
            return unescape(document.cookie.substring(offset, end))
         }
    else return
     }
}
把想要输出的内容，放到jb51tuitan()函数里面的判断语句里面即可。