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方案一：
1.主页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>load_method</title>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
*{margin: 0;padding: 0}
html, body{height: 100%}
#nav{float: left;width:5%;height:100%;background-color: antiquewhite}
#con{float: right;width: 95%;height:100%;background-color: aqua}
</style>
<script>
$(document).ready(function(){
//页面加载的时候，内容框默认显示 a.html
$('#con').load('./a.html');
//单击 a 链接，加载 a.html
$("#a1").click(function(){
$('#con').load('./a.html');
});
//单击 b 链接，加载 b.html
$("#a2").click(function(){
$('#con').load('./b.html');
});
})
</script>
</head>
<body>
<ul id="nav">
<li><a href="#" id="a1">show a</a></li>
<li><a href="#" id="a2">show b</a></li>
</ul>
<div id="con"></div>
</body>
</html>2.页面a
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<p>I'm a page!</p>
</body>
</html>3.页面b
!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<p>I'm b page!</p>
</body>
</html>