<style>
#idParentDiv{width:100%;height:3000px;padding:30px;background-color:buttonshadow;}
#idDiv{width:400px;height:80px;background-color:#FFD700;padding:6px;}
#idCodeDiv{width:100%;padding:4px;font-family:verdana,tahoma;margin:12px 0px 0px 0px;background-color:#EEEEEE;font-weight:bold;}
</style>

<script>
var iValue=0;
function rdl_doAdd(e){
var oCodeDiv=document.all("idCodeDiv");
var oDiv=document.all("idDiv");
var oNum=document.all("idNum");
iValue+=1;
oNum.value=oDiv.style.margin=iValue.toString()+"px";
oCodeDiv.innerText="margin : "+oNum.value+" ; ";
}
function rdl_doDvv(e){
var oCodeDiv=document.all("idCodeDiv");
var oDiv=document.all("idDiv");
var oNum=document.all("idNum");
iValue-=1;
oNum.value=oDiv.style.margin=iValue.toString()+"px";
oCodeDiv.innerText="margin : "+oNum.value+" ; ";
}
</script>

<div id=idParentDiv>
<div id=idDiv><img src="http://www.geekg.com/files/images6/b5042104281d4ff9e6c0615d81a47409.jpg" style="float:left;border:21px solid #abce00;">请从下方选属性的值。</div>
</div>
<br>
<table><tr><td>
<input id=idNum type=text value="0px" size=40 readonly>
</td><td>
<input type=button onclick="rdl_doAdd();" value=" + " id=idBtn1>
</td><td>
<input type=button onclick="rdl_doDvv();" value=" - " id=idBtn2>
</td></tr></table>
<div id=idCodeDiv>margin : 0px ; </div>

友情提示：全选代码复制运行，您也可以先修改部分代码再运行。