微信端

<input type="button" value="购买" class="goumai_btn" data-id="${item.id}">

 $(document).on('click','.goumai_btn', function() {
    console.log($(this).attr("data-id"));
});

加载层

//显示遮罩
$.showLoading("正在加载...");
//关闭遮罩
$.hideLoading();