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Challenge Target the same element with multiple jQuery Selectors has an issue. User Agent is: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36. Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

<script>
  $(document).ready(function() {
    $("button").addClass("animated ");
    $(".btn").addClass("shake");
    $("#target1").addClass("btn-primary");
   
  });
</script>

<!-- 请只修改这条注释以上的代码 -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="btn btn-default target" id="target1">#target1</button>
        <button class="btn btn-default target" id="target2">#target2</button>
        <button class="btn btn-default target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>
      </div>
    </div>
  </div>
</div>

$("button").addClass("animated ");

去掉animated后面的空格，就好啦，它可能是根据加入的class里有没有空格来判断是几个class