javascript 行间样式与非行间样式获取方法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .style001 {width: 300px;height: 300px;margin: 20px;padding: 30px;border: 20px grey solid;background-color: lightgray;display: inline-block;}
    </style>
    <script type="text/javascript">
    window.onload = function(){
        var oDiv1 = document.getElementsByClassName('style001')[0];
        var oDiv2 = document.getElementsByClassName('style002')[0];
        var aBtn = document.getElementsByTagName('input');

        aBtn[0].onclick = function(){
            var jsonStyle = {};
            if(this.currentStyle)
            {
                //IE
                jsonStyle = {oDiv1.currentStyle.width,height:oDiv1.currentStyle.height,background:oDiv1.currentStyle.backgroundColor};
            }
            else
            {
                //FF
                jsonStyle = {getComputedStyle(oDiv1,false).width,height:getComputedStyle(oDiv1,false).height,background:getComputedStyle(oDiv1,false).backgroundColor}
            }
            oDiv1.innerHTML += '<br>宽'+ jsonStyle.width + '<br>高' + jsonStyle.height + '<br>背景色' + jsonStyle.background;
        };

        aBtn[1].onclick = function(){
            var jsonStyle = {};
            jsonStyle = {oDiv2.style.width,height:oDiv2.style.height,background:this.style.backgroundColor};
            oDiv2.innerHTML += '<br>宽'+ jsonStyle.width + '<br>高' + jsonStyle.height + '<br>背景色' + jsonStyle.background;
        };

        aBtn[2].onclick = function(){
            oDiv1.style.backgroundColor = 'blue';
            oDiv2.style.backgroundColor = 'blue';
        };
    };
    </script>
</head>
<body>
<div class="style001">内敛样式</div>
<div class="style002" style=" 300px;height: 300px;margin: 20px;padding: 30px;border: 20px grey solid;background-color: lightgray;display: inline-block;">行间样式</div>
<br/>
<input type="button" value="获取内敛样式" id="btn1"/>
<input type="button" value="获取行间样式" id="btn2"/>
<input type="button" value="设置行间样式" id="btn3"/><p>通过oDiv.style.width = 50+'px';都是设置行间样式</p>
</body>
</html>
工欲善其事必先利其器