1 <!doctype html> 2 <html> 3 <head> 4 <meta charset='utf-8'> 5 <style> 6 .title {background-color:#ccc;width: 150px} 7 </style> 8 </head> 9 <body>10 <table style='width:600px'>11 <tr>12 <td class='title'>哈哈</td>13 <td>aa</td>14 <td class='title'>大都市</td>15 <td>bb</td>16 </tr>17 <tr>18 <td class='title'>adad</td>19 <td colspan='3'>alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉alkjd阿拉快的拉拉</td>20 </tr>21 </table>22 </body>23 </html>
此种情况下 在ie7、ie8下 第一行的 3列会被明显撑大，并未能按样式宽度（width: 150px) 显示
解决方案：
1、写死每列宽度
2、把 width:150px 修改成 width:20% 用百分比
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