<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#p1").html("attr('checked'): " + $("input").attr('checked')
+ "<br>prop('checked'): " + $("input").prop('checked'));
});
});
</script>
</head>
<body>
<p><b>Note:</b> Check and uncheck the checkbox and then click the button to refresh content.</p>
<button>Check value of attr() and prop()</button>
<br><br>
<input id="check1" type="checkbox" checked>
<label for="check1">Check me</label>
<p id="p1"></p>
</body>
</html>