Ajax 下拉加载数据

　　　　$(document).scroll(function() {
var pageHeight = $(document).height()-$(window).height();
var bodyScrollTop = $('body').scrollTop();

if(bodyScrollTop >= pageHeight) {
$('#moress').find('.not').remove();
$.ajax({
type : 'get', data: {},
url : '/product/ajax/'+start,
success: function(a, b, c) {
$('#moress').append(a);
start = start+10;
var width = $('dl').width();
var height = Math.floor((width*3)/4);
$('dl dt').height(height);
}
});
}
})