JS implementation code for adding rows, copying rows, and deleting rows_javascript skills

/**
Add line fanjf
*/
function addRow(tableId,trId){
var tableObj = document.getElementById(tableId);
var trObj = document.getElementById(trId);
//var trIndex = trObj.rowIndex 1;
var rows = tableObj.rows.length;
var cell = "";
var tr = tableObj.insertRow(rows);
for( i=0;i cell= tableObj.rows(rows).insertCell(i);
cell.innerText= trObj.cells(i).innerText;
cell.className= trObj.cells(i).className;
cell.innerHTML= trObj.cells(i).innerHTML;
}
}
/**
Delete row fanjf
*/
function deleteRow(tableId,trId){

var tableObj = document.getElementById(tableId);
var trObj = document.getElementById(trId);

//var trIndex = trObj.rowIndex;//Copy the row number of tr
var rows = tableObj.rows.length;
if(rows>0){
tableObj.deleteRow(rows-1);
}else{
alert("No card number information to delete ! ");
}
}