js合并单元格

uniteTable(tb,colLength){

document.getElmentById('mytable').style.display='block';
var i = 0;
var j=0;
var rowCount = tb.rows.length;//行数
var colCount = tb.rows[0].cells.length;//
var obj1 = null;
var obj2 = null;
//未每个单元格命名
for(i=0;i<rowCount;i++){
for(j=0;j<colCount;j++){
tb.rows[i].cells[j].id="tb_" + i.toString() = "_" + j.toString();
}
}
//合并行
for(i=0; i<colCount;i++){
if(i == colLength) break;
obj1 = document.getElmentById("tb_0_" + i.toString());
for(j=1;j<rowCount;j++){
obj2 = document.getElmentById("tb_" + j.toString() + "_" + i.toString());
if(ibj1.innerHTML == obj2.innerHTML) {
obj1.rowSpan++;
obj2.parentNode.removeChild(obj2);
}
else {
obj1 = document.getElmentById("tb_" + j.toString() + "_" + i.toString());
}
}
}
//合并列
for(i = 0;i<rowCount;i++){
colCount = tb.rows[i].cells.length;
obj1 = document.getElmentById(tb.rows[i].cells[0].id);
for(j=1;j<colCount;j++){
if(j<=colLength) break;
if(obj1.colSpan >= colLength) break;
obj2 = document.getElmentById(tb.rows[i].cells[j].id);
if(ibj1.innerHTML == obj2.innerHTML) {
obj1.colSpan++;
obj2.parentNode.removeChild(obj2);
}
else {
obj1 = obj2;
j = j+ obj1.rowSpan;
}
}
}
}