Example learning of DOM operations and events in jquery Drop-down box application_jquery

Today's demo is about drop-down boxes.

The function implemented is to add the selected option on the left to the right, double-click an option on the left Options can also be added to the right. Click the Add All to Right button to add all the left to the right.
jquery code:

dblclick() It is triggered when the mouse double-clicks the event.
Other methods and events have been introduced in previous examples, so I won’t go into details here.
This demo code is simple. And the function is indeed practical.