點擊按鈕 換一批 效果

<html>
<head>
</head>
<body>

<div id="box1" style="">111</div>
<div id="box2" style="display:none">222</div>
<div id="box3" style="display:none">333</div>
<button class="btn1" id="button">按扭</button>
<script type="text/javascript">
var i=0;
document.getElementById('button').onclick=function(){
	var a=document.getElementsByTagName('div'),l=a.length;
	a[i++].style.display='none';
	if(i>=l)i=0;
	a[i].style.display='block';
}
</script>
</body>
</html>
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