当外链JQuery失败时，从本地网站上引用JQuery，可以把以下代码放置<head></head>之间，但是必须放在外链如
<code>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
</code>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
</code>
的后面。
以下是放置代码
<code>
<script type="text/javascript">
//<![CDATA[
//判断是否成功将Jquery库引入，如果没有成功引入则引入本地Jquery库
if (typeof jQuery == 'undefined') {document.write("<script type=\"text/javascript\" src=\"http://os.yefengs.com/wp-content/themes/yefengs/js/jquery.min.js\"><\/script>");}
//]]>
</script>
</code>
<script type="text/javascript">
//<![CDATA[
//判断是否成功将Jquery库引入，如果没有成功引入则引入本地Jquery库
if (typeof jQuery == 'undefined') {document.write("<script type=\"text/javascript\" src=\"http://os.yefengs.com/wp-content/themes/yefengs/js/jquery.min.js\"><\/script>");}
//]]>
</script>
</code>
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