jQuery rename id from class elements

I have the following html. Its a table that can contains many rows id=rows_x.

<div class="row_table" id="row_开发者_如何学C1">
<div class="row_table" id="row_2">
<div class="row_table" id="row_3">
<div class="row_table" id="row_4">

Then I have id button that once clicked will delete the id ="row_2"

$("#button").click(function(){
     $('#row_2').remove();
    /* Rename rows id goes here */
}

And now for my question:

Since row_2 has been removed I need to be able to rename all following rows.

row_3 should become row_2, etc...

I'd suggest:

$("#button").click(function(){
     $('#row_2').remove();

     // iterates through each of the elements matched by the selector
     $('.row_table').each(
          // i represents the index of each of the elements
          function(i){
              // sets the id of each of the returned elements
              // to the string concatenated with the expression 'i + 1'
              this.id = 'row_' + (i+1);
          });
});

JS Fiddle.