JavaScript simulation of a chat window that can be expanded, dragged, and closed _ javascript tips-js tutorial

This article describes how to simulate a JavaScript chat window that can be expanded, dragged, and closed. The example shows how to use javascript to implement the div layer that can be dragged, which is of great practical value, if you need it, you can refer to the imitation QQ chat window implemented by using JavaScript. You can expand the layer, drag the layer, close the layer, and send messages easily. It's good, and there are not many codes, it is suitable for beginners to study and be more practical. You can expand many JS + CSS applications on this basis.

 Layer expansion, layer dragging, and layer Closure