The _javascript technique of the information layer with arrows based on JavaScript to realize mouse suspension and follow the mouse movement

Many web sites, when the mouse hovering over an element can pop up an information description layer, and this layer can follow the mouse movement, while the pop-up layer with arrows, this arrow pointing to the mouse hover elements, the following is a simple example of how to achieve this effect.
The code instance is as follows:

<! DOCTYPE html>  

The above code to achieve our requirements, when the mouse is placed in the Div can pop up an information layer, and can follow the mouse to move, the pop-up layer with the indicated arrows, the code is very simple here is not much to introduce, if you have any questions can post message or read related reading.