<style>
div{
width:200px;
height:100px;
}
</style>
<div id="div1" style="border:1px solid black;"></div>
<div id="divmsg"></div>
<script>
window.onload = function(){
    var obj = document.getElementById("div1");
    var crtstyle = obj.currentStyle || obj.ownerDocument.defaultView.getComputedStyle(obj, null);// 前者用于IE，后者FF
    var str = "";
    for(var e in crtstyle){
        str += e + " === " + crtstyle[e] + "<br/><br/>";
    }
    document.getElementById("divmsg").innerHTML = str;
}
</script>

------解决方案--------------------
http://www.phpx.com/man/dhtmlcn/objects/currentStyle.html

currentStyle是只读的

------解决方案--------------------
getComputedStyle应是除IE外都支持的

------解决方案--------------------
找 最终样式