jquery 标准数组循环 each用法

<script type="text/javascript">

$(function(){

var now_url = location.href, navLinks;
navLinks = $('#menu_nav').find('a');
$.each(navLinks , function( i , elem ){
if($(elem).attr('href') == now_url){
$(elem).addClass('nav-now');
}
});
})
</script>