js 相同内容单元格合并

function tableSpan(tb1) {
//合并行
//列
for (var i = tb1.rows[0].childNodes.length - 1; i >= 0; i--) {
//行
for (var j = tb1.rows.length - 1; j > 0; j--) {
//当前单元格与上一单元格比较
if (tb1.rows[j].childNodes[i].innerHTML == tb1.rows[j - 1].childNodes[i].innerHTML) {
tb1.rows[j - 1].childNodes[i].rowSpan += tb1.rows[j].childNodes[i].rowSpan;
tb1.rows[j].removeChild(tb1.rows[j].childNodes[i]);
}
}
}

//合并列
//行
for (var i = tb1.rows.length - 1; i >= 0; i--) {
break; //不合并列
//列
for (var j = tb1.rows[i].childNodes.length - 1; j > 0; j--) {
//当前单元格与左一单元格比较
if (tb1.rows[i].childNodes[j].innerHTML == tb1.rows[i].childNodes[j - 1].innerHTML) {
tb1.rows[i].childNodes[j - 1].colSpan += tb1.rows[i].childNodes[j].colSpan;
tb1.rows[i].removeChild(tb1.rows[i].childNodes[j]);
}
}
}
}