scrapy xpath 问题

[yangjiaronga]

<tr>
<td style="vertical-align:top;">Copper, Cu&nbsp;</td>
<td class="dataCell" style="vertical-align:top;"><= 0.03 %<span class="dataCondition"></span></td>
<td class="dataCell" style="vertical-align:top;"><= 0.03 %<span class="dataCondition"></span></td>
<td class="dataComment" style="vertical-align:top;"></td>
</tr>

**response.xpath('/tr').extract()
只能获取到**

<tr>
<td style="vertical-align:top;">Copper, Cu&nbsp;</td>
<td class="dataCell" style="vertical-align:top;"></td>
<td class="dataCell" style="vertical-align:top;"></td>
<td class="dataComment" style="vertical-align:top;"></td>
</tr>

<= 0.03 % 和 <span></span>消失不见，为什么呢？

[leavic]

确定你看的网页源码是关闭了 javascript 状态下的