记录一个实现随意拖拽div的实现方法，当作备忘吧，指不定什么时候用到了呢。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>divDrag</title>
<style>
#div1{
width: 300px;
height: 300px;
background-color: #ccc;
/*一定要绝对定位*/
position: absolute;
}
</style>
</head>
<body>
<div id="div1"></div>
<script src="drag.js"></script>
</body>
</html>
window.onload = function(){
var div1 = document.getElementById("div1");
div1.onmousedown = function(ev){
var oevent = ev || event;
var distanceX = oevent.clientX - div1.offsetLeft;
var distanceY = oevent.clientY - div1.offsetTop;
document.onmousemove = function(ev){
var oevent = ev || event;
div1.style.left = oevent.clientX - distanceX + 'px';
div1.style.top = oevent.clientY - distanceY + 'px';
};
document.onmouseup = function(){
document.onmousemove = null;
document.onmouseup = null;
};
;
};
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