//cookie是个字符串型的 判断其长度
if(cookie.length == 0 ){
alert('不存在cookie')
}
<a target="_blank" href="http://down.123.com/abc.pdf" onclick="return chkcookies()">下载PDF</a><script>
function chkcookies()
{
var NameOfCookie="abc_2010_cookie"
var c = document.cookie.indexOf(NameOfCookie+"=")
if (c != -1)
{
return true
}
else
{
alert("您还没注册")
location.href="http://www.123.com/reg.html"
}
return false
}
</script>
