Ajax 요청 오류, PHP에서 도메인 간 요청을 활성화하는 방법

<?php 
	header(&#39;Access-Control-Allow-Origin: *&#39;);
	$arr = [
		array(&#39;id&#39;=>1,&#39;title&#39;=>&#39;one1&#39;),
		array(&#39;id&#39;=>2,&#39;title&#39;=>&#39;one2&#39;),
		array(&#39;id&#39;=>3,&#39;title&#39;=>&#39;one3&#39;),
		array(&#39;id&#39;=>4,&#39;title&#39;=>&#39;one4&#39;),
	];

	echo json_encode($arr);
 ?>

<script type="text/javascript" src="jq.js"></script>
<script type="text/javascript">
	$.ajax({
		type:&#39;post&#39;,
		url: &#39;http://127.0.0.1/demo1/api.php&#39;,
		contentType: "application/x-www-form-urlencoded",
		dataType: &#39;json&#39;,
		success: function(res){
			console.log(res)
		}
	})
</script>