Obtain the background-image attribute of a div using js.

I have never paid attention to the property of div's background-image before, but set its url. Today I have encountered a problem and I would like to record it.
Copy codeThe Code is as follows:
<Div id = "img_2" style = "width: 133px; height: 95px; cursor: pointer; background-image: url('Chrysanthemum.jpg ');" onclick = "tempClick () "> </div>

Get image attributes in js
Copy codeThe Code is as follows:
Document. getElementById ('img _ 2'). style. backgroundImage;

Pay attention to the black part. In the div, It is the background-image, and in the get attribute, It is the backgroundImage. This should be done for all the styles with "-". This is to be verified,

Record this problem first.