页头页尾加载方法

<div id="header">
    <img src="loading.gif" alt="">              //等待的gif图
</div>
<div id="main">
    <h3>首页</h3>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus amet architecto asperiores culpa error, maiores natus neque officiis perspiciatis repellendus sed sunt. Eius eos molestias nihil placeat possimus sit veniam.</p>
</div>

header("Content-Type:text/html;charset=UTF-8");       //设置响应头
?>
<hr>                                                  //输出HTML代码
<p id="copyright">版权所有? 2017-10-11</p>

<script>
    $(document).ready(fn)/*页面加载完成后实现*/
    $(function(){         /*页面加载完成后实现*/
        $("#header").load("footer.php")
    })
</script>