Ecshop is a floating customer service code. how can this problem be solved?

Ecshop followed by a floating customer service code on the network. I found a document for adding a js package one afternoon. write I want to directly control the display background of the front-end qq to add and modify the background, which is more convenient. who has better code for me .., A non-floating e-ecshop with a floating customer service code
On the Internet, I searched for a js package one afternoon using document. I want to directly control the display backend of qq at the front end. it is more convenient to add and modify the display backend. who has better code ..

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This function is already available for non-floating ec. if you want to float it, let's take a look at how data is transmitted and study it!
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There are a lot of free such things available ..
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Yes, jqr! Ext can also be used. ajax can be used more !!
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Write your own js ......