问获取特定元素的xpath和css选择器的最佳方法

EN

$('*').unbind('click.m5').bind('click.m5', function(ev) {
  if (this != ev.target) return;

  var cn = function(elem) {
    var n = $(elem).parent().children().index(elem);
    return elem.tagName + ':nth-child(' + n + ')';
  };
  var selector = cn(this);
  $(this).parents().each(function() {
    if (/BODY|HTML/.test(this.tagName))
      selector = this.tagName + '>' + selector;
    else
      selector = cn(this) + '>' + selector;
  });
  console.log("Selector: " + selector);
  $(selector).css('background-color', 'red');
});