javascript - How to get a difference between two cursor positions at the two different moment? -

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for example have 1 position of cursor, put in variable, , want difference between variable , cursor position after 10 ms. have no idea do.

i want make such drag'n'drop might drag element without focusing concretely it. i'm here, it's bullshit, may understand want)).

    <!doctype html> <html> <head>     <title>example</title>     <style>     .red {     width:500px;     height:100px;     background:red;         cursor: move;     position:relative; }  .green {     width:100px;     height:100px;     background:green;     position:absolute;     left:0; }      </style>     <script src="http://code.jquery.com/jquery-2.1.0.min.js" type="text/javascript"></script>     <script type="text/javascript">         var draggble = false; var currentleft; var currentx;  $(document).on("mousedown",".red",function(){     draggble = true;     currentleft = parseint($(".green").css("left"),10); });  $(document).on("mouseup", "body", function () {         draggble = false; });  $(document).on("mousemove","body",function(e){     currentx = e.pagex;     if(draggble){         settimeout(function(){         currentleft = currentleft + currentx - e.pagex;         $(".green").css("left",currentleft);           },10);     } });     </script> </head> <body>     <div class="red">     <div class="green"></div>     </div> </body> </html>

http://jsfiddle.net/f8kx9/

i'm sorry awful english, it's first time when need write.


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