freeCodeCamp/target-elements-by-class-using-jquery.md at 41d40608a1b807d2597c348914b2a03dd3acad1e

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id, title, required, challengeType, forumTopicId, localeTitle

title

required

challengeType

forumTopicId

localeTitle

bad87fee1348bd9aedc08826

Target Elements by Class Using jQuery

link
https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css

18316

使用 jQuery 配合 class 选择器选择元素

Description

我们如何使所有的button标签有弹性的动画效果？我们用$("button")选取所有的button标签，并用.addClass("animated bounce");给其添加一些 CSS 属性。 jQuery 的.addClass()方法用来给标签添加类。首先，我们使用$(".well")选取类为well的div标签。值得注意的是，和 CSS 声明一样，在类名前需要添加.。然后，用 jQuery 的.addClass()方法添加animated和shake类。例如，在document ready function中添加下面的代码，能使所有类为text-primary的标签抖动： $(".text-primary").addClass("animated shake");

Instructions

Tests

tests:
  - text: 用 jQuery 的<code>addClass&#40&#41</code>方法给所有类为<code>well</code>的标签添加<code>animated</code>和<code>shake</code>类。
    testString: assert($(".well").hasClass("animated") && $(".well").hasClass("shake"));
  - text: 仅用 jQuery 给标签添加类。
    testString: assert(!code.match(/class\.\*animated/g));

Challenge Seed

<script>
  $(document).ready(function() {
    $("button").addClass("animated bounce");
  });
</script>

<!-- 请修改本行以上的代码 -->

<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>

Solution

<script>
  $(document).ready(function() {
    $("button").addClass("animated bounce");
    $(".well").addClass("animated shake");
  });
</script>

<!-- Only change code above this line. -->

<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>

3.7 KiB Raw Blame History