获得焦点除去class和失去焦点获得class

html:

<li class="top-relative tt huge">餐厅员工数：<input type="number" class="numb" ><em>人</em></li>

js:

$('.top-relative input').focus(function(){

$('li.top-relative').removeClass("top-relative").css('background','red');


console.log(3);
})
$('.top-relative input').blur(function(){
$('.tt').addClass("top-relative");
console.log(4);

});