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

Copy code The code is as follows:

var customerInfoMethod ={
//Copy and add lines
copyrow:function(obj,id)
{
var rowIndex=obj.parentNode.parentNode.rowIndex;
var resrow=document.getElementById(id);
rowIndex--;
var newRow=resrow.cloneNode(true);//document.createElement("tr");
var parent = resrow.parentNode;
if(parent.lastChild == resrow){
/ /If targetElement is the last child element of parent, insert newElement
parent.appendChild(newRow);
}else{
//If not, insert it in front of the next sibling node of targetElement
parent. insertBefore(newRow, resrow.nextSibling);
}

//newRow.innerHTML=resrow.innerHTML;
var selectObj = newRow.getElementsByTagName("select");
for(var a=0;a<selectObj.length;a ){
selectObj[a].options[0].selected=true;
}
var inputObj = newRow.getElementsByTagName("input");
inputObj[0].style.display="";
inputObj[1].style.display="none";
},
//Copy and add rows
copyrowUpdate:function( obj,id)
{
var rowIndex=obj.parentNode.parentNode.rowIndex;
var resrow=document.getElementById(id);
rowIndex--;
var newRow=resrow. cloneNode(true);//document.createElement("tr");
var parent = resrow.parentNode;
if(parent.lastChild == resrow){
//If targetElement is the last one of parent Child element, insert newElement
parent.appendChild(newRow);
}else{
//If not, insert it in front of the next sibling node of targetElement
parent.insertBefore(newRow, resrow.nextSibling );
}
//newRow.innerHTML=resrow.innerHTML;
var selectObj = newRow.getElementsByTagName("select");
for(var a=0;a<selectObj.length; a ){
selectObj[a].options[0].selected=true;
}
var inputObj = newRow.getElementsByTagName("input");
for(var i=0;i< ;inputObj.length-2;i ){
inputObj[i].value="0";
}
inputObj[inputObj.length-2].style.display="";
inputObj[inputObj.length-1].style.display="none";
},
//Delete row
deleteRow:function(rootId,obj) {
var rootTable = $(rootId );
rootTable.deleteRow(obj.parentNode.parentNode.rowIndex);
}
}

/**
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<trObj.cells.length;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 ! ");
}
}