Draggable () Restrict moving area when dragging

Jquery-ui provides us with a very handy drag-and-drop method: Draggable (), when using this method, we might want the control to move only in one area and not be dragged out of the boundary, so we can use the following method:

When calling Draggable ():

$ (' #element '). Draggable ({containment: ' #background '});

The code above is to limit the drag range of element to background.

Draggable () parameters are described in http://blog.csdn.net/liu_111111/article/details/8906025

Draggable () Restrict moving area when dragging