求大神来看为li元素设置相同的padding为何padding-bottom和padding-rig

     无标题文档  	body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td,img {padding:0;margin:0;} 	#div1{		margin:10px;		width:300px;		height:200px;	}	#div1 textarea{		width:300px;		height:180px;	}	#div2{		margin:10px auto;		height:400px;		width:400px;		border:1px solid black;		overflow:auto;	}	#div2 ul li{		border-bottom:1px dashed black;		list-style:none;		padding:10px 10px 10px 10px;			}  	window.onload=function(){		var adiv1=document.getElementById("div1");		var adiv2=document.getElementById("div2");		var obtn=adiv1.getElementsByTagName("input")[0];		var otxt=adiv1.getElementsByTagName("textarea")[0];		var oul=document.getElementById("ul1");		obtn.onclick=function(){			var oli=document.createElement("li");			oli.innerHTML=otxt.value;			otxt.value="";			if(oul.children.length>0)				oul.insertBefore(oli,oul.children[0]);			else				oul.appendChild(oli);			//运动			var iheight=oli.offsetHeight;			alert(iheight);			oli.style.height="0";			move(oli,{height:iheight});		};	};		function getStyle(obj,attr){		if(obj.currentStyle)			return obj.currentStyle[attr];		else			return getComputedStyle(obj,false)[attr];	}	function move(obj,json,fun){		clearInterval(obj.timer);		obj.timer=setInterval(function(){			var astop=true;			for(var attr in json){				var cur=0;				if(attr=="opacity")					cur=Math.round(parseFloat(getStyle(obj,attr))*100);				else					cur=parseInt(getStyle(obj,attr));				var speed=(json[attr]-cur)/10;				speed=speed>0?Math.ceil(speed):Math.floor(speed);				if(cur!=json[attr])					astop=false;				if(attr=="opacity"){					if(obj.style.filter)						obj.style.filter="alpha(opacity:"+(speed+cur)+")";					else						obj.style.opacity=(speed+cur)/100;				}				else					obj.style[attr]=speed+cur+"px";			}			if(astop){				clearInterval(obj.timer);				if(fun)					fun();			}		},30);	}   	


      
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