EasyUI datagrid 从左至右递归合并表格

采用分治思想，从上到下，从左至右，递归合并

        function initMerge(data){
   
            if (data.length<=0)return;
            let propertyNames=['p1','p1'];
            treeMerge(data,propertyNames,0,0,data.length-1);
        }

        function treeMerge(data,propertyNames,level,start,end){
   
            if (level>=propertyNames.length)return;
            let propertyName=propertyNames[level];
            let preValue=data[start][propertyName];
            let i = start;
            for (;i <= end; i++) {
   
                if (data[i][propertyName]!==preValue){
   
                    $('#dgName').datagrid('mergeCells',{
   index: start,rowspan: i-start,field:propertyName});
                    treeMerge(data,propertyNames,level+1,start,i-1);
                    treeMerge(data,propertyNames,level,i,end);
                    return;
                }
            }
            $('#dgName').datagrid('mergeCells',{
   index: start,rowspan: i-start,field:propertyName});
            treeMerge(data,propertyNames,level+1,start,end);
        }