在页面中怎么过滤掉后面多余的空格
<p><span style="font-family: arial,helvetica,sans-serif;"><span style="font-size: 12px;"> </span></span></p>
<p><span style="font-family: arial,helvetica,sans-serif;"><span style="font-size: 12px;"> </span></span></p>
<p><span style="font-family: arial,helvetica,sans-serif;"><span style="font-size: 12px;">                                                                                                                                                                                                                                  </span></span></p>

[解决办法]
偶来也 还有这等好事