About jQuery realizing the copy, delete and calculation functions of html table row Tr

This article mainly introduces jQuery's implementation of the copy, delete, and calculation functions of html table row Tr. It involves jQuery's common copying, adding, deleting, and calculating the number of rows in table tables. Friends who need it can refer to it. I hope Can help everyone.

The example in this article describes the jQuery implementation of the copy, delete, and calculation functions of html table row Tr. Share it with everyone for your reference, the details are as follows:

Add row:

function addtr(){
   var tr = $("#tb tr").eq(0).clone();
   tr.appendTo("#tb");
   //tr.insertBefore("#tb tr:last");
}

<table id="tb">
  <tr>  </tr>  // tr 的下标从 0 开始
   <tr> </tr>
</table>

Delete row:

index The subscript of the tr in the table to be deleted

$("#tb_id tr").eq(index).remove();

Calculate the number of tr in the table:

("#tb tr").length

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