[JavaScript]代码    

<script type="text/javascript">  window.onload = function() {  var tab = document.getElementById("statStdCountTable");       var maxCol = 3, val, count, start;  //maxCol：合并单元格作用到多少列           for(var col = maxCol-1; col >= 0 ; col--) {           count = 1;           val = "";           for(var i=0; i<tab.rows.length; i++) {               if(val == tab.rows[i].cells[col].innerHTML) {                   count++;              } else {                  if (count > 1) {                   //合并                       start = i - count;                      tab.rows[start].cells[col].rowSpan = count;                      for(var j=start+1; j<i; j++) {                          tab.rows[j].cells[col].style.display = "none";                      }                      count = 1;                  }                  val = tab.rows[i].cells[col].innerHTML;              }          }             if(count > 1 ) {            //合并，最后几行相同的情况下              start = i - count;              tab.rows[start].cells[col].rowSpan = count;              for(var j=start+1; j<i; j++) {                  tab.rows[j].cells[col].style.display = "none";              }      }  }  };  </script>