ajax实现session不过期(避免页面过期的现象)

script src="js/Jquery1.7.js" type="text/javascript">/script>
script type="text/javascript">
$(function () {
function post() {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebBlock.aspx"
})
}
setInterval(post, 30000);
})
/script>