效果如下：
all code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>拖拽</title>
<style>
*{margin:0px;padding: 0px;}
.drage{width: 200px;height: 200px;background: red;position: absolute;cursor: move;}
#coor {
width: 10px;
height: 10px;
overflow: hidden;
cursor: se-resize;
position: absolute;
right: 0;
bottom: 0;
background-color: #09C;
}
</style>
</head>
<body>
<div class="drage">
<div id="coor"></div>
</div>
</body>
</html>
<script src="js/jquery-2.1.4.js"></script>
<script>
$(function(){
$('.drage').mousedown(function(ev) {
var X = ev.pageX - $('.drage').offset().left;
var Y = ev.pageY - $('.drage').offset().top;
$(document).mousemove(function(ev) {
$('.drage').css({'left':ev.pageX - X,'top':ev.pageY - Y})
});
$(document).mouseup(function(ev){
$(document).unbind();
});
});
/* $("#coor").mousedown(function(ev){
var xstr=ev.pageX;
// console.log(xstr);
$(document).mousemove(function(ev){
var xmov=ev.pageX;
var n=1-((xstr-xmov)/720);
console.log(xmov+":"+(xstr-xmov)+":"+(xstr-xmov/962).toFixed(2)+":"+n);
$(".drage").css({'transform':'scale('+n+')','left':0,'top':0});
})
})*/
})
</script>