还可以通过e.isTrigger来判断，代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery.17.js"></script>
<style>
</style>
</head>
<body>
<input type='checkbox' id='try'>try
<script type="text/javascript">
$(function() {
$('#try').change(function(e){
if (e.isTrigger)
{
alert ('not a human');
}else{
alert ('human');
}
});
$('#try').trigger('change'); //doesn't alert
});
</script>
</body>
</html>
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