jQuery.fn.rowspan = function (colIdx) { //封装JQuery同列值相同合并小插件

        return this.each(function () {

            var that;

            $('tr', this).each(function (row) {

                $('td:eq(' + colIdx + ')', this).filter(':visible').each(function (col) {

                    if (that != null && $(this).html() == $(that).html()) {

                        rowspan = $(that).attr("rowSpan");

                        if (rowspan == undefined) {

                            $(that).attr("rowSpan", 1);

                            rowspan = $(that).attr("rowSpan");

                        }

                        rowspan = Number(rowspan) + 1;

                        $(that).attr("rowSpan", rowspan);

                        $(this).hide();

                    } else {

                        that = this;

                    }

                });

            });

        });

    }

$("#ceshi").rowspan(0); //.rowspan(0)从0即第一列开始

function hb(){

var tab = document.getElementById("subtable");

var maxCol = 3, val, count, start;

var ys="";

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;

if(ys=="#00FFFF"){

ys="#EEEE00";

}else{

ys="#00FFFF";

}

tab.rows[start].cells[col].rowSpan = count;

tab.rows[start].cells[1].style.backgroundColor=ys;//改变颜色

// ys="#EEEE00";

// tab.rows[i].cells[1].style.backgroundColor="#00FFFF";//改变颜色绿色

for(var j=start+1; j<i; j++){ //

tab.rows[j].cells[col].style.display = "none";

tab.rows[j].removeChild(tab.rows[j].cells[col]);

}

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].removeChild(tab.rows[j].cells[col]);

}

}

}

}