先看一下最终合并之后的效果，能对单选、复选框进行按照某一列的合并。
最开始的解决方案来自于这篇博客介绍的方法：https://blog.csdn.net/guishifoxin/article/details/81480136
但是还是存在没能解决的问题。
在完善之后达到的效果：
一：单选、复选
原来加入开启了单选或者多选之后会将全部的单选按钮都合并了。
也传入合并列名field,layui默认是0。
其实这个时候就需要结合业务去控制了，需要知道是根据哪一个字段将整个表格分为几个单选的行，使用之前的代码会将全部的单选按钮合并。
改造之后效果：
1、按照不同的字段进行合并
2、checkbox也能合并
二、多表格混乱或不显示
layui的每一个表格都会有一个index作为标识，并且是01234…这样的顺序。所以在使用的时候指定需要进行行合并的表格序号。
全部代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>表格合并行工具</title>
<script type="text/javascript" src="你的layui等静态文件地址"></script>
<script>
var teatTable1Data = [
{"location":"西南","cityName":"昆明","province":"云南","area":"100平方千米","prople":"300万"},
{"location":"西南","cityName":"曲靖","province":"云南","area":"100平方千米","prople":"700万"},
{"location":"西南","cityName":"玉溪","province":"云南","area":"100平方千米","prople":"600万"},
{"location":"西南","cityName":"成都","province":"四川","area":"100平方千米","prople":"400万"},
{"location":"西南","cityName":"宜宾","province":"四川","area":"100平方千米","prople":"400万"},
{"location":"西北","cityName":"银川","province":"宁夏","area":"100平方千米","prople":"500万"},
{"location":"西北","cityName":"乌鲁木齐","province":"新疆","area":"100平方千米","prople":"600万"},
{"location":"西北","cityName":"喀什","province":"新疆","area":"100平方千米","prople":"600万"},
{"location":"西北","cityName":"西宁","province":"青海","area":"100平方千米","prople":"500万"},
{"location":"西北","cityName":"兰州","province":"甘肃","area":"100平方千米","prople":"400万"},
{"location":"西北","cityName":"酒泉","province":"甘肃","area":"100平方千米","prople":"300万"},
];
var teatTable2Data = [
{"location2":"亚洲","cityName22":"北京","province2":"中国","area2":"100平方千米","prople2":"300万"},
{"location2":"亚洲","cityName2":"孟买","province2":"印度","area2":"100平方千米","prople2":"700万"},
{"location2":"亚洲","cityName2":"东京","province2":"日本","area2":"100平方千米","prople2":"600万"},
{"location2":"欧洲","cityName2":"巴黎","province2":"法国","area2":"100平方千米","prople2":"400万"},
{"location2":"欧洲","cityName2":"伦敦","province2":"英国","area2":"100平方千米","prople2":"400万"},
{"location2":"欧洲","cityName2":"伦敦2","province2":"英国","area2":"100平方千米","prople2":"500万"},
{"location2":"欧洲","cityName2":"柏林","province2":"德国","area2":"100平方千米","prople2":"600万"},
{"location2":"美洲","cityName2":"纽约","province2":"美国","area2":"100平方千米","prople2":"600万"},
{"location2":"美洲","cityName2":"纽约2","province2":"美国","area2":"100平方千米","prople2":"500万"},
{"location2":"美洲","cityName2":"华盛顿","province2":"美国","area2":"100平方千米","prople2":"400万"},
{"location2":"美洲","cityName2":"多伦多","province2":"加拿大","area2":"100平方千米","prople2":"300万"},
];
var teatTable3Data = [
{"location3":"银河系","cityName3":"地球","province3":"太阳系","area3":"100平方千米","prople3":"300万"},
{"location3":"银河系","cityName3":"月球","province3":"太阳系","area3":"100平方千米","prople3":"700万"},
{"location3":"银河系","cityName3":"土星","province3":"太阳系","area3":"100平方千米","prople3":"600万"},
{"location3":"银河系","cityName3":"水星","province3":"太阳系","area3":"100平方千米","prople3":"400万"},
{"location3":"银河系","cityName3":"金星","province3":"太阳系","area3":"100平方千米","prople3":"400万"},
{"location3":"银河系","cityName3":"旅行者1号","province3":"太阳系","area3":"100平方千米","prople3":"500万"},
{"location3":"银河系","cityName3":"旅行者2号","province3":"太阳系","area3":"100平方千米","prople3":"600万"},
{"location3":"银河系","cityName3":"天王星","province3":"太阳系","area3":"100平方千米","prople3":"600万"},
{"location3":"三体星系","cityName3":"三体星1","province3":"半人马座三星","area3":"100平方千米","prople3":"500万"},
{"location3":"三体星系","cityName3":"三体星2","province3":"半人马座三星","area3":"100平方千米","prople3":"400万"},
{"location3":"三体星系","cityName3":"三体星2","province3":"半人马座三星","area3":"100平方千米","prople3":"300万"},
];
layui.use('table', function(){
var table = layui.table;
table.render({
data:teatTable1Data,
title: '测试表格1',
elem: '#test-table1',
defaultToolbar: false,
page: false,
cols: [[
{type: 'radio', align: 'center'},
{field: 'location', title: '位置区域', align: 'center'},
{field: 'province', title: '省份', align: 'center'},
{field: 'area', title: '面积', align: 'center'},
{field: 'cityName', title: '城市', align: 'center'},
{field: 'prople', title: '人口数量', align: 'center'}
]],
done:function () {
/**
* 参数1 需要合并列的数组，0代表的是合并单选按钮或者是复选框 radio/checkbox 后端需要将这些字段进行排序
* 参数2 当前表格的index (用于在一个页面中有使用了多个表格的情况，如果只有一个表格填0就行
* index这个值是表格加载的顺序，从0开始，如果页面上表格很多建议debug用 $(".layui-table-body")[index]看一下就拿到了)
* 参数3 是按照html元素合并，还是按照标签中的text内容合并，建议填true
* 参数4 radio/checkbox根据哪一行去合并
*/
layuiRowspan(['0','location', 'province', 'prople'],"0",true,"location");
}
});
table.render({
data:teatTable2Data,
title: '测试表格2',
elem: '#test-table2',
defaultToolbar: false,
page: false,
cols: [[
{type: 'checkbox', align: 'center'},
{field: 'location2', title: '位置区域', align: 'center'},
{field: 'province2', title: '省份', align: 'center'},
{field: 'area2', title: '面积', align: 'center'},
{field: 'cityName2', title: '城市', align: 'center'},
{field: 'prople2', title: '人口数量', align: 'center'}
]],
done:function () {
/**
* 参数1 需要合并列的数组，0代表的是合并单选按钮或者是复选框 radio/checkbox 后端需要将这些字段进行排序
* 参数2 当前表格的index (用于在一个页面中有使用了多个表格的情况，如果只有一个表格填0就行
* index这个值是表格加载的顺序，从0开始，如果页面上表格很多建议debug用 $(".layui-table-body")[index]看一下就拿到了)
* 参数3 是按照html元素合并，还是按照标签中的text内容合并，建议填true
* 参数4 radio/checkbox根据哪一行去合并
*/
layuiRowspan(['0','location2', 'province2', 'prople2'],"1",true,"location2");
}
});
table.render({
data:teatTable3Data,
title: '测试表格3',
elem: '#test-table3',
defaultToolbar: false,
page: false,
cols: [[
{type: 'radio', align: 'center'},
{field: 'location3', title: '位置区域', align: 'center'},
{field: 'province3', title: '省份', align: 'center'},
{field: 'area3', title: '面积', align: 'center'},
{field: 'cityName3', title: '城市', align: 'center'},
{field: 'prople3', title: '人口数量', align: 'center'}
]],
done:function(){
/**
* 参数1 需要合并列的数组，0代表的是合并单选按钮或者是复选框 radio/checkbox 后端需要将这些字段进行排序
* 参数2 当前表格的index (用于在一个页面中有使用了多个表格的情况，如果只有一个表格填0就行
* index这个值是表格加载的顺序，从0开始，如果页面上表格很多建议debug用 $(".layui-table-body")[index]看一下就拿到了)
* 参数3 是按照html元素合并，还是按照标签中的text内容合并，建议填true
* 参数4 radio/checkbox根据哪一行去合并
*/
layuiRowspan(['0','location3', 'province3', 'prople3'],"2",true,"location3");
}
});
});
//行合并 start
function execRadioRows(childFilterArr,ckChildFilterArr,flag){
//获取td的个数和种类
var chChildFilterTextObj = {};
var chText = [];
var chIndex = [];
for(var i = 0; i < ckChildFilterArr.length; i++){
var chChildText = flag?ckChildFilterArr[i].innerHTML:ckChildFilterArr[i].textContent;
if(chChildFilterTextObj[chChildText] == undefined){
chChildFilterTextObj[chChildText] = 1;
chText.push(chChildText);
}else{
var num = chChildFilterTextObj[chChildText];
chChildFilterTextObj[chChildText] = num*1 + 1;
}
}
for (var i = 0; i < chText.length; i++) {
var chNum = 0;
for (var j = 0; j < ckChildFilterArr.length ; j++) {
var chChildText = flag?ckChildFilterArr[j].innerHTML:ckChildFilterArr[j].textContent;
if(chText[i] == chChildText){
chNum = chNum +1
}
}
chIndex.push(chNum);
}
var newIndex = [];
for (var i = 0; i < chIndex.length; i++) {
if(i == 0){
newIndex.push(0);
}else {
var newNum = 0;
for (var j = 0; j < chIndex.length; j++) {
if(j<i){
newNum = newNum +chIndex[j];
}
}
newIndex.push(newNum);
}
}
chIndex = newIndex;
for (var j = 0; j < childFilterArr.length; j++) {
var findFlag = false;
for (var k = 0; k < chIndex.length; k++) {
if(j == chIndex[k]){
findFlag = true;
if(chIndex[k+1] != null){
childFilterArr[j].setAttribute("rowspan",chIndex[k+1] - j);
$(childFilterArr[j]).find("div.rowspan").parent("div.layui-table-cell").addClass("rowspanParent");
$(childFilterArr[j]).find("div.layui-table-cell")[0].style.height= (chIndex[k+1] - j)*38-10 +"px";
}else {
childFilterArr[j].setAttribute("rowspan",childFilterArr.length - j);
$(childFilterArr[j]).find("div.rowspan").parent("div.layui-table-cell").addClass("rowspanParent");
$(childFilterArr[j]).find("div.layui-table-cell")[0].style.height= (childFilterArr.length - j)*38-10 +"px";
}
}
}
if(findFlag == false){
childFilterArr[j].style.display = "none";
}
}
}
function execRowspan (fieldName,index,flag,ckRows){
var fixedNode = $(".layui-table-body")[index];
var child = $(fixedNode).find("td");
var childFilterArr = [];
for(var j = 0; j < child.length; j++){
child[j].getAttribute('data-field')
if(child[j].getAttribute("data-field") == fieldName){
childFilterArr.push(child[j]);
}
}
var ckChildFilterArr = [];
if(fieldName == "0"){
for(var j = 0; j < child.length; j++){
child[j].getAttribute('data-field')
if(child[j].getAttribute("data-field") == ckRows){
ckChildFilterArr.push(child[j]);
}
}
execRadioRows(childFilterArr,ckChildFilterArr,flag);
return;
}
//获取td的个数和种类
var childFilterTextObj = {};
for(var i = 0; i < childFilterArr.length; i++){
var childText = flag?childFilterArr[i].innerHTML:childFilterArr[i].textContent;
if(childFilterTextObj[childText] == undefined){
childFilterTextObj[childText] = 1;
}else{
var num = childFilterTextObj[childText];
childFilterTextObj[childText] = num*1 + 1;
}
}
var canRowspan = true;
var maxNum;//以前列单元格为基础获取的最大合并数
var finalNextIndex;//获取其下第一个不合并单元格的index
var finalNextKey;//获取其下第一个不合并单元格的值
for(var i = 0; i < childFilterArr.length; i++){
(maxNum >9000 || !maxNum)&&(maxNum = $(childFilterArr[i]).prev().attr("rowspan")&&fieldName!="8"?$(childFilterArr[i]).prev().attr("rowspan"):9999);
var key = flag?childFilterArr[i].innerHTML:childFilterArr[i].textContent;//获取下一个单元格的值
var nextIndex = i+1;
var tdNum = childFilterTextObj[key];
var curNum = maxNum<tdNum?maxNum:tdNum;
if(canRowspan){
for(var j =1;j<=curNum&&(i+j<childFilterArr.length);){//循环获取最终合并数及finalNext的index和key
finalNextKey = flag?childFilterArr[i+j].innerHTML:childFilterArr[i+j].textContent;
finalNextIndex = i+j;
if((key!=finalNextKey&&curNum>1)||maxNum == j){
canRowspan = true;
curNum = j;
break;
}
j++;
if((i+j)==childFilterArr.length){
finalNextKey=undefined;
finalNextIndex=i+j;
break;
}
}
childFilterArr[i].setAttribute("rowspan",curNum);
if($(childFilterArr[i]).find("div.rowspan").length>0){//设置td内的div.rowspan高度适应合并后的高度
$(childFilterArr[i]).find("div.rowspan").parent("div.layui-table-cell").addClass("rowspanParent");
$(childFilterArr[i]).find("div.layui-table-cell")[0].style.height= curNum*38-10 +"px";
}
canRowspan = false;
}else{
childFilterArr[i].style.display = "none";
}
if( --childFilterTextObj[key] == 0 | --maxNum==0 | --curNum==0 | (finalNextKey!=undefined && nextIndex==finalNextIndex)){
canRowspan = true;
}
}
}
function layuiRowspan(fieldNameTmp,index,flag,ckRows){
var fieldName = [];
if(typeof fieldNameTmp == "string"){
fieldName.push(fieldNameTmp);
}else{
fieldName = fieldName.concat(fieldNameTmp);
}
for(var i = 0;i<fieldName.length;i++){
execRowspan(fieldName[i],index,flag,ckRows);
}
}
//行合并 end
</script>
</head>
<body>
<div class="layui-fluid">
<div class="layui-row layui-col-space10">
<div class="layui-col-sm4">
<div class="grid-demo grid-demo-bg1">
<table class="layui-table" id="test-table1" lay-filter="test-table1"></table>
</div>
</div>
<div class="layui-col-sm4">
<div class="grid-demo">
<table class="layui-table" id="test-table2" lay-filter="test-table2"></table>
</div>
</div>
<div class="layui-col-sm4">
<div class="grid-demo">
<table class="layui-table" id="test-table3" lay-filter="test-table3"></table>
</div>
</div>
</div>
</div>
</body>
</html>
依然存在的问题（但不影响使用）：
1、radio或者是checkbox按钮没有垂直居中。
2、选中样式或者是鼠标移动样式没有调整（还是会蛇皮拐弯）。
