简易的图片拖拽，以前在www.b5l.cn实验过
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
.div1{
width: 200px;
height: 200px;
background: red;
position: absolute;
}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById("div1");
oDiv.onmousedown=function(ev){
var oEvent=ev||event;
disX=oEvent.clientX-oDiv.offsetLeft;
disY=oEvent.clientY-oDiv.offsetTop;
document.onmousemove=function(ev){
var oEvent=ev||event;
var l=oEvent.clientX-disX;
var p=oEvent.clientY-disY;
var cWidth=document.documentElement.clientWidth-200;
var cHeight=document.documentElement.clientHeight-200;
if(l<0){
l=0;
}else if(l>cWidth){
l=cWidth;
}
if(p<0){
p=0;
}else if(p>cHeight){
p=cHeight;
}
oDiv.style.left=l+'px';
oDiv.style.top=p+'px';
}
document.onmouseup=function(){
document.onmousemove=null;
document.onmouseup=null;
}
}
}
</script>
</head>
<body>
<div class="div1" id="div1"></div>
</body>
</html>
上面的图片DIV背景可以改为应用的图片，亲测可用