img的complete方法

<style>    
body,ul,li{margin:0;padding:0;}    
body{background:#000;}    
img{border:0;border-radius:3px;}    
ul{list-style-type:none;}    
#box{width:212px;border:5px solid #fff;overflow:hidden;zoom:1;background:#fff;border-radius:5px;margin:10px auto;padding:0 0 3px 3px;}    
#box li,#box li img{float:left;width:50px;height:50px;}    
#box li{margin:3px 3px 0 0;}    
#box li.first{position:relative;}    
#box li.first,#box li.first img{width:156px;height:156px;}    
#box li.first div{position:absolute;top:0;left:0;width:156px;height:156px;display:none;opacity:0.5;filter:alpha(opacity=50);background:#fff url(img/loading.gif) 50% 50% no-repeat;}    
</style>    
<script type="text/javascript">    
window.onload = function ()    
{    
	var oImg = document.getElementById("box").getElementsByTagName("img");    
	var oDiv = document.getElementsByTagName("div")[0];    
	for (var i = 1; i < oImg.length; i++)    
	{    
		oImg[i].onmouseover = function ()    
		{						
    
			var img = new Image();    
			img.src = oImg[0].src = this.src.replace(/small/,"big");    
			oDiv.style.display = "block";    
			img.complete ? oDiv.style.display = "none" : (oImg[0].onload = function() {oDiv.style.display = "none"})    
		}	
    
	}    
};    
</script>    
</head>    
<body>    
<ul id="box">    
<li class="first"><img src="img/big_1.jpg"><div></div></li>    
<li><a href="javascript:;"><img src="img/small_1.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_2.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_3.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_4.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_5.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_6.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_7.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_8.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_9.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_10.jpg"></a></li>    
<li><a href="javascript:;"><img src="img/small_11.jpg"></a></li>    
</ul>    
</body>

如上述，

img.complete ? oDiv.style.display = "none" : (oImg[0].onload = function() {oDiv.style.display = "none"})

这句不太懂，另外图片比较小，是否真的有判断加载的必要？

刺槐少女

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慕设计2395807

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慕设计2395807

LAWTVYAQMPSQSBLVQSVEOKHKUPSCSUQAJWXZWLIENKGWVKADGCRHKGPZLKRUVYVSCLQYUKNQMOYUDAODGPFJMIYBACFCYODMCSHEAPYOYBEBXNYTQNJTJFIEOZACMVRURAXTTIXHDTPRORMDLIKVKTIYOKSODGPZDKAWGTVKHKMISOQMNPRHVFOSBEUCLNXURGJEHXGOKHDADTQGTUCRBXUJUQGCVEGQSCLVKSCSTHEAJZCSORMHQTHQZOEHEHOQTPSVLNQTLRAGWQJQQWDZORTQTCLHETSISAQTJFCFVIXNQGWTPSBEYGXNQZOKBKMQFHFHFTWFPKKSJMCYGIFOEBDZPGCYUXUWAWFPLCLBKUDAIFIFIQNQMCSUQGPMJYMJMZIXCYOXUKHXUPFORAYUQACJRNQMHRBXGJJLBRURNKMWMWEBETILNJZCYGWMCFOKTIENPLBRUDLILFRUWMVYVQMILHJMPLHETJTIUCSVYAKUDLHOPGCMCRBEHPQSNKNDAJYIYBJNDZJLILHXVXAJHKZILUXHQZBXNWMPYOJFHEORTIEOQDYURNQRBKACIRUKLUQHQGJRMBFBXNDMPSHQSVZPFISHPSNXTPFPFOKAXMPLIFOXGWGPEIRUEBRAWTGILCLBQAPZVYTPGPMOKNVXKTCSUXMJZPRVLHXNVSOYSVKYGWMXNCSIEEZHEACZIRHEQZORNCSILBXYAWNCLVQSPFHJXGWMCYOEHGIENKNDNCZIDLUQNJTJGIRSOXGXAJAPLOUWYVEZPYORBKZVXACMILIRSBAATTNJJZBZBOWTZQHHHQGIEBKTDUPRAKMPZVMOYAKMBWZPSVXBKHDIXTKAKTWNQZQJIZGMCISYPZIDNJTIRNDT

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