html实现页⾯左中右布局，可扩展性的页⾯布局：左右结构，左
中右结构
左右结构，左边100%；右边宽度固定
css
#header{height:80px; background:#CCC;}
#center{overflow:hidden; zoom:1;}
#main_wrapper{float:left; width:100%; margin-top:10px; margin-left:-210px;}
#main{height:200px; margin-left:210px; background:#999;}
#sidebar{float:right; width:200px; margin-top:10px; height:200px; background:#AAA;}
#footer{height:50px; margin-top:10px; background:#CCC;}
HTML
左右结构，左边固定，右边100%
css
#header{height:80px; background:#CCC;}
#center{overflow:hidden; zoom:1;}
#sidebar{float:left; width:200px; margin-top:10px; height:200px; background:#AAA;}
#main_wrapper{float:right; width:100%; margin-top:10px; margin-left:-210px;}
#main{height:200px; margin-left:210px; background:#999;}
#footer{height:50px; margin-top:10px; background:#CCC;}
html
左中右结构，左边固定，右边固定，中间100%;
css布局左边固定右边自适应css
#header{height:80px; background:#CCC;}
#center{overflow:hidden; zoom:1;}
#sidebar-l {float:left; width:200px; margin-top:10px; height:200px; background:#AAA;}
#main-wrapper {margin-top:10px; float:left; width:100%; margin-left:-420px; height:200px;} #main {margin-left:438px; background:#999; height:200px;}
#sidebar-r {float:right; width:200px; margin-top:10px; height:200px; background:#AAA;}
#footer{height:50px; margin-top:10px; background:#CCC;}
html
这⾥是左边
这⾥是中间
这⾥是右边