css中:
table-layout:auto | fixed
word-wrap : normal | break-word
word-break : normal | break-all | keep-all
经过各个取值试用后觉得如下组合效果是最好的：
< table style='table-layout:fixed'>
< tr>
< td style='word-wrap : break-word'>文本或图片内容</td>
< /tr>
< /table>
