Analysis of jQuery's method of realizing interlaced color change (compared to native JS)

var tab = document.getElementByTagName('table')[0];
var tr = tab.getElementByTagName('tr');
for(var i=0;i<tr.length;i++){
  if(i%2==0){
    tr[i].style.background="orange";
  }else{
    tr[i].style.background="#abcdef";
  }
}

$('table tr:odd').css('background','orange');
$('table tr:even').css('background','#abcdef');

$('table tr').filter(':odd').css('background','orange').end().filter(':even').css('background','#abcdef');