//本来要给火狐提交bug的，发现复现不鸟，我勒个去
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<style>
html,body{
100%;
height:100%;
}
body{
position:relative
}
section{
position:absolute
}
.s1{
left:10px;
}
.s2{
left:40px;
}
.s3{
left:80px
}
input{
display:none;
outline:none
}
</style>
<body>
<section class="s1">
11
</section>
<section class="s2">
11
</section>
<section class="s3">
11
</section>
<input type="text">
<script>
var Drag = function( e ){
this.e = typeof e === "string" ? document.getElementById(e) : e;
this.initDrag();
}
Drag.prototype = {
zIndex : 0,
constructor : Drag,
initDrag : function(){
this.e.addEventListener("mousedown",this.ev.bind(this));
},
ev : function(e){
switch(e.type){
case "mousedown":
this.dx = e.clientX - this.e.offsetLeft;
this.dy = e.clientY - this.e.offsetTop;
this.e.zIndex = this.zIndex++;
this.fn = this.ev.bind(this);
document.addEventListener("mousemove",this.fn);
document.addEventListener("mouseup",this.fn);
break;
case "mousemove":
this.e.style.left = e.clientX - this.dx + "px";
this.e.style.top = e.clientY - this.dy + "px";
break;
case "mouseup":
document.removeEventListener("mouseup",this.fn)
document.removeEventListener("mousemove",this.fn)
break;
};
e.cancelBubble = true;
e.defaultPrevented = true;
e.stopPropagation();
e.preventDefault();
return
}
};
Array.prototype.slice.call(document.querySelectorAll("section"),null).forEach(function(e,i){
new Drag(e);
e.addEventListener("mouseup",function(){
var css = Object.create( window.getComputedStyle(e,null) ),
t = parseInt(css.top) + "px",
l = parseInt(css.left) + "px";
/************************************/
e.style.left = 0;
e.style.top = 0;
/************************************/
console.log( window.getComputedStyle(e,null).left )
console.log( window.getComputedStyle(e,null).top )
e.style.left = l
e.style.top = t
});
});
</script>
</body>
</html>