JQuery：clickClass()之后单击函数仍然有效

DOM元素：

<button class="btn btn-warning shopping"> Shop </button>

这是Javascript事件监听器：
一旦完成功能,它将删除.shopping,因此事件不会再触发.

$('.shopping').click(function(e){
    var that = this;
    alert( $(that).attr('class')); //btn btn-warning shopping

    //Ajax request
    $.get('processShopping.PHP',function(data){
    if(data == "success"){
        if($(that).hasClass('shopping')){
            $(that).removeClass('shopping');
            alert( $(that).attr('class'));//btn btn-warning
        }
    }
    });
});

购物课程已被删除,但行动仍然触发！