Cacher is the code snippet organizer for pro developers

$(".target:nth-child(2)").addClass("animated bounce");

/*
查找.target元素,选择那种是父元素的第2个子元素的元素,下面target2与target会被选中
如果使用:eq(2),那么只有第index+1个即target3被选中
 <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="target" id="target1">#target1</button>
        <button class="target" id="target2">#target2</button>
        <button class="target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="target" id="target4">#target4</button>
        <button class="target" id="target5">#target5</button>
        <button class="target" id="target6">#target6</button>
      </div>
*/