In jquery, when an element is added using append, the element's binding listener event is invalidated

Example: If in a <div id= "Resultarea" ></div>, add a id= "checkouttip" text box through append, listening for value changes. The usual direct $ ("Selector"). On ("EventType", function () {}) Listener event function does not work, such as the button's click-Listen event should read: $ ("#resultArea"). On ("Input PropertyChange "," #checkOutTip ", function () {Console.info (" formerly Available ");});

　　

In jquery, when an element is added using append, the element's binding listener event is invalidated