一、使用<div>元素布局

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>div布局</title>
    <style type="text/css">
        body{
            margin:0px;
        }
        #container{
            width:100%;
            height:950px;
            background-color:darkgray;
        }
        #heading{
            width:100%;
            height:10%;
            background-color:aqua;
        }
        #content_menu{
            width:30%;
            height:80%;
            background-color:aquamarine;
            float:left;
        }
        #content_body{
            width:70%;
            height:80%;
            background-color:blueviolet;
            float:left;
        }
        #footing{
            width: 100%;
            height: 10%;
            background-color: black;
            clear: both;
        }
    </style>
</head>
<body>
    <div id="container">
        <div id="heading">头部</div>
        <div id="content_menu">内容菜单</div>
        <div id="content_body">内容主体</div>
        <div id="footing">底部</div>
 
    </div>
</body>
</html>


二、使用<table>元素布局

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>table布局</title>
    <style type="text/css">
        body{
            margin:0px;
        }
        #container{
            width:100%;
            height:950px;
            background-color:darkgray;
        }
        #heading{
            width:100%;
            height:10%;
            background-color:aqua;
        }
        #content_menu{
            width:30%;
            height:80%;
            background-color:aquamarine;
            float:left;
        }
        #content_body{
            width:70%;
            height:80%;
            background-color:blueviolet;
            float:left;
        }
        #footing{
            width: 100%;
            height: 10%;
            background-color: black;
            clear: both;
        }
    </style>
</head>
<body>
    <table width="100%" height="950px" style="background-color: darkgray">
        <tr>
            <td colspan="2" width="100%" height="10%" style="background-color:aqua">这是头部</td>
        </tr>
        <tr>
            <td width="30%" height="80%" style="background-color:blue">左菜单</td>
            <td width="70%" height="80%" style="background-color:blueviolet">主体</td>
        </tr>
        <tr>
            <td width="100%" height="10%" colspan="2" style="background-color: darkcyan">这是底部</td>
        </tr>
    </table>
</body>
</html>