table 的rolspan和rowspan

<span style="color: #0000ff;"><br><img src="/static/imghw/default1.png" data-src="http://images2015.cnblogs.com/blog/982930/201609/982930-20160903110120808-505545250.png" class="lazy" alt=""><br>如图所示啦，容易让初学者混乱的两个东西<br>仔细看看分析下呢，就比较简单了<br><br><span   style="max-width:90%">table </span><span style="color: #ff0000;">width</span><span style="color: #0000ff;">="300"</span><span style="color: #ff0000;"> border</span><span style="color: #0000ff;">="2"</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">th </span><span style="color: #ff0000;">scope</span><span style="color: #0000ff;">="col"</span><span style="color: #0000ff;">></span><span style="color: #ff0000;"> </span><span style="color: #0000ff;"></span><span style="color: #800000;">th</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">th </span><span style="color: #ff0000;">scope</span><span style="color: #0000ff;">="col"</span><span style="color: #0000ff;">></span><span style="color: #ff0000;"> </span><span style="color: #0000ff;"></span><span style="color: #800000;">th</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">th </span><span style="color: #ff0000;">scope</span><span style="color: #0000ff;">="col"</span><span style="color: #0000ff;">></span><span style="color: #ff0000;"> </span><span style="color: #0000ff;"></span><span style="color: #800000;">th</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"></span><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td </span><span style="color: #ff0000;">rowspan</span><span style="color: #0000ff;">="2"</span><span style="color: #0000ff;">></span>1<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>2a<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>3a<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"></span><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>2<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>3<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"></span><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td</span><span style="color: #0000ff;">></span><span style="color: #ff0000;"> </span><span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><span style="color: #800000;">td </span><span style="color: #ff0000;">colspan</span><span style="color: #0000ff;">="2"</span><span style="color: #0000ff;">></span>4<span style="color: #0000ff;"></span><span style="color: #800000;">td</span><span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"></span><span style="color: #800000;">tr</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">table</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>