方法2:*{margin:0; padding:0;}
#wrap{width:970px; margin:0 auto;}
#mainbody{ position:relative; margin-top:15px;}
#left{ border:1px solid #999;float:left;width:110px; }
#mid{ float:left;width:650px;border:1px solid #999; margin-left:13.5px;}
#right{border:1px solid #999;position:absolute;left:791px; }
#wrap{width:970px; margin:0 auto;}
#mainbody{ position:relative; margin-top:15px;}
#left{ border:1px solid #999;float:left;width:110px; }
#mid{ float:left;width:650px;border:1px solid #999; margin-left:13.5px;}
#right{border:1px solid #999;position:absolute;left:791px; }
2016-09-26
#wrap{width:970px; margin:0 auto;}
#mainbody{ margin-top:15px;}
#left{ border:1px solid #999;float:left;width:110px; }
#mid{ float:left;width:650px;border:1px solid #999; margin-left:13.5px;}
#right{border:1px solid #999;width:177px; float:right; }
#mainbody{ margin-top:15px;}
#left{ border:1px solid #999;float:left;width:110px; }
#mid{ float:left;width:650px;border:1px solid #999; margin-left:13.5px;}
#right{border:1px solid #999;width:177px; float:right; }
2016-09-26