126 lines
3.7 KiB
Markdown
126 lines
3.7 KiB
Markdown
---
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id: bad87fee1348bd9aed208826
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title: 使用 jQuery 选择元素的子元素
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challengeType: 6
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forumTopicId: 18320
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dashedName: target-the-children-of-an-element-using-jquery
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---
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# --description--
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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<dfn>子标签（children element）</dfn>。 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。
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jQuery 有一个 `children()` 方法，可以访问被选取标签的子标签。
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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 `blue`（蓝色）：
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```js
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$("#left-well").children().css("color", "blue")
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```
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# --instructions--
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将 `right-well` 元素的所有子元素设置为橙色（orange）。
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# --hints--
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`#right-well` 的所有子元素应该有橙色文本。
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```js
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assert($('#right-well').children().css('color') === 'rgb(255, 165, 0)');
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```
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应该用 `children()` 函数修改这些元素。
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```js
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assert(code.match(/\.children\(\)\.css/g));
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```
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应该仅用 jQuery 给标签添加 class。
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```js
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assert(code.match(/<div class="well" id="right-well">/g));
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```
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# --seed--
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## --seed-contents--
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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});
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</script>
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<!-- Only change code above this line -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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# --solutions--
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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$("#right-well").children().css("color", "orange");
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});
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</script>
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<!-- Only change code above this line -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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