<body>
<input type="button" id="btn" value="click" />
<div id="div1" style="width:50px; height:50px; background:red; display:none"></div>
<div id="div2" style="width:50px; height:50px; background:yellow; display:none"></div>
<div id="div3" style="width:50px; height:50px; background:#000; display:none"></div>
<div id="div4" style="width:50px; height:50px; background:#0F6; display:none"></div>
<div id="div5" style="width:50px; height:50px; background:#CF6; display:none"></div>
</body>
<script>
var oBtn = document.getElementById('btn');
var aDiv = document.getElementsByTagName('div');
var index = 0;
oBtn.onclick = function(ev){
if(aDiv[index%5].style.display == 'block'){
aDiv[index%5].style.display = 'none';
} else {
aDiv[index%5].style.display = 'block';
}
index++;
};
</script>
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<input type="button" id="btn" value="click" />
<div id="div1" style="width:50px; height:50px; background:red; display:none"></div>
<div id="div2" style="width:50px; height:50px; background:yellow; display:none"></div>
<div id="div3" style="width:50px; height:50px; background:#000; display:none"></div>
<div id="div4" style="width:50px; height:50px; background:#0F6; display:none"></div>
<div id="div5" style="width:50px; height:50px; background:#CF6; display:none"></div>
</body>
<script>
var oBtn = document.getElementById('btn');
var aDiv = document.getElementsByTagName('div');
var index = 0;
oBtn.onclick = function(ev){
if(aDiv[index%5].style.display == 'none'){
aDiv[index%5].style.display = 'block';
}
if(index%5==0){
oBtn.style.display = 'none';
}
index++;
};
</script>