table th td 宽度

 table{
 2     200px;
 3     table-layout: fixed;
 4 }
 5 .autocut{
 6     overflow:hidden;
 7     white-space:nowrap;
 8     text-overflow:ellipsis;
 9     -o-text-overflow:ellipsis;
10     -icab-text-overflow: ellipsis;
11     -khtml-text-overflow: ellipsis;
12     -moz-text-overflow: ellipsis;
13     -webkit-text-overflow: ellipsis;
14 }
15 .autocut:hover
16 {
17     overflow:visible;
18     white-space:normal;
19     word-wrap: break-word;
20 }

 <td class="autocut">