table 合并单元格方法

<span style="font-family:Microsoft YaHei;font-size:14px;">//合并单元格
		function cellHandler(){
		    var tab = document.getElementById("data_table");

			//maxCol循环列
		    var maxCol = 2, val, count, start;

		    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";
		            }
		        }
    		}
		};</span>