freeCodeCamp/target-the-children-of-an-element-using-jquery.md at 873fce02a2d2124f3b76ce3f317fb29b34abb542

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Oliver Eyton-Williams dec409a4bd fix: s/localeTitle/title/g

2020-10-06 23:10:08 +05:30

3.9 KiB

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id, challengeType, forumTopicId, title

id	challengeType	forumTopicId	title
bad87fee1348bd9aed208826	6	18320	使用 jQuery 选择元素的子元素

Description

把 HTML 标签放到另一个级别的标签里，这些 HTML 标签被称为该标签的子标签（children element）。例如，本次挑战中文本为 "#target1"、"#target2" 和 "#target3" 的按钮都是<div class="well" id="left-well">标签的子标签。 jQuery 有一个children()方法，可以访问被选取标签的子标签。下面的代码展示了用children()方法把left-well标签的子标签的颜色设置成蓝色（blue）： $("#left-well").children().css("color", "blue")

Instructions

请把right-well标签的所有子标签颜色设置成橙色（orange）。

Tests

tests:
  - text: <code>#right-well</code>所有的子标签文本应该是橙色。
    testString: assert($("#right-well").children().css("color") === 'rgb(255, 165, 0)');
  - text: 应该用<code>children&#40&#41</code>方法修改标签。
    testString: assert(code.match(/\.children\(\)\.css/g));
  - text: 仅用 jQuery 给标签添加类。
    testString: assert(code.match(/<div class="well" id="right-well">/g));

Challenge Seed

<script>
  $(document).ready(function() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");

  });
</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() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");
    $("#right-well").children().css("color", "orange");
  });
</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>

3.9 KiB Raw Blame History Unescape Escape