ajax请求

// 删除优惠券
function removeCoupon(e, coupon_id) {
    var msg = "您真的确定要删除吗？\n\n请确认！";
    if (confirm(msg) == false){
        return false;
    }

    var request = $.ajax({
        url: URL + '/removeCoupon',
        method: 'POST',
        data: {coupon_id: coupon_id},
        dataType: 'json'
    });

    request.done(function (res) {
        if (res.sign == 1) {
            var $v = $(e);
            $v.parent().parent().remove();
        } else {
            alert(res.msg);
        }
    });

    request.fail(function (jqXHR, textStatus) {
        alert('Request failed: ' + '网络不稳定，请稍后重试...');
    })
}

js