Learn drag and drop js to implement code classics_javascript skills

Drag and drop examples recommended in the Pro Javascript Techniques book: http://boring.youngpup.net/2001/domdrag

<title>Drag</title> <style type="text/css"> </style> <div id="r" style="position:absolute; left:100px; top:100px; background-color:red; height:80px; width:80px;"> </div> <div id="g" style="position:absolute; left:250px; top:100px; background-color:green; height:80px; width:80px;"> </div> <div id="b" style="position:absolute; left:400px; top:100px; background-color:blue; height:80px; width:80px;"> </div>
[Ctrl A Select all Note:

If you need to introduce external Js, you need to refresh to execute
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