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報(bào)錯(cuò)myFocus.set() undefined

我的代碼如下

<head>
	<meta?charset="UTF-8">
	<title>慕課網(wǎng)</title>
	<link?rel="stylesheet"?href="css/index.css">	
	<script?scr="js/myfocus-2.0.1.min.js"?type="text/javascript"?charset="utf-8"></script>
	<script?scr="js/mf-pattern/mF_YSlider.js"?type="text/javascript"?charset="utf-8"></script>
	<link?rel="stylesheet"?href="js/mf-pattern/mF_YSlider.css">
	<script?type="text/javascript">
		myFocus.set({
			id:'picBox'
		});
	</script>

</head>
<div?class="ad"?id="picBox">
		<div?class="pic">
			<ul>
				<li><img?src="imagescr/ad2.jpg"?alt="展示圖片"></li>
				<li><img?src="imagescr/ad3.jpg"?alt="展示圖片"></li>
				<li><img?src="imagescr/ad4.jpg"?alt="展示圖片"></li>
			</ul>
		</div>
	</div>

焦點(diǎn)圖沒(méi)效果，調(diào)試發(fā)現(xiàn)瀏覽器報(bào)錯(cuò)說(shuō)：myFocus.set() undefined，可是檢查了JS文件引入路徑，發(fā)現(xiàn)沒(méi)問(wèn)題，求大神指教