4.5 KiB
4.5 KiB
id | required | challengeType | forumTopicId | title | |||
---|---|---|---|---|---|---|---|
bad87fee1348bd9aed108826 |
|
6 | 18315 | 使用 jQuery 选择元素的特定子元素 |
Description
CSS 选择器(CSS Selectors)
选取标签。target:nth-child(n)
CSS 选择器可以选取所有的第 n 个标签并设置目标属性和目标样式。
下面的代码展示了给每个区域(well)的第 3 个标签设置bounce
类:
$(".target:nth-child(3)").addClass("animated bounce");
请给每个区域(well)的第 2 个标签设置bounce
类,必须用target
类选取标签。
Instructions
Tests
tests:
- text: <code>target</code>标签中的第二个标签应该有弹性的动画效果。
testString: assert($(".target:nth-child(2)").hasClass("animated") && $(".target:nth-child(2)").hasClass("bounce"));
- text: 应该仅两个标签有弹性的动画效果。
testString: assert($(".animated.bounce").length === 2);
- text: 应该用<code>:nth-child()</code>选择器修改这些标签。
testString: assert(code.match(/\:nth-child\(/g));
- text: 仅用 jQuery 给标签添加类。
testString: assert(code.match(/\$\(".target:nth-child\(2\)"\)/g) || code.match(/\$\('.target:nth-child\(2\)'\)/g) || code.match(/\$\(".target"\).filter\(":nth-child\(2\)"\)/g) || code.match(/\$\('.target'\).filter\(':nth-child\(2\)'\)/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");
$("#right-well").children().css("color", "orange");
});
</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");
$(".target:nth-child(2)").addClass("animated bounce");
});
</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>