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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<input class="myClass" type="checkbox" checked></br>
<input class="myClass" type="checkbox" checked></br>
<input class="myClass" type="checkbox" checked></br>
<script type="text/javascript">
function changeObject() {
var o = document.getElementsByClassName("myClass");
for (var i = 0; i < o.length; ++i) {
o[i].type = (o[i].type == 'radio') ? 'checkbox' : 'radio';
o[i].focus();
}
}
</script>
<button type="button" onclick="changeObject()">click</button>
</body>
</html>
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