一、左边固定，右边自适应的布局
1. 左边左浮动，右边加个overflow:hidden;
#lt{ float: left;width:200px;
background: #ff0;}
#rt{ overflow: hidden; background:
#f0f;}
2. 左边左浮动，右边加个margin-left;
#lt{ float: left; width:200px;
background: #ff0;}
#rt{ margin-left: 200px;
background: #f0f;}
3. 左边绝对定位，右边加个margin-left;
#lt{ position:
absolute; top:0; left:0; width:200px; background:
#ff0;}
#rt{ margin-left: 200px;
background: #f0f;}
4. 左右两边绝对定位，右边加个width,top,left,right
#lt{ position: absolute; top:0 ; left:0 ;width:200px;
background: #ff0;}
#rt{ position: absolute; top:0;left:200px;width:100%;rigth:0;background: #f0f;}
