jQuery - not（）不使用新添加的元素类

If I click the numbers div, I should get an alert. If I click the clicker, a class of less is added to the numbers div, and any click after that on the numbers div should NOT show the alert, since it now has the class of less. Instead, I still get the alert, as if the less class is not there. What am I doing wrong? If I click the numbers div, I should get an ale