freeCodeCamp/curriculum/challenges/chinese/03-front-end-libraries/jquery/target-the-children-of-an-e...

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---
id: bad87fee1348bd9aed208826
title: 使用 jQuery 选择元素的子元素
challengeType: 6
forumTopicId: 18320
dashedName: target-the-children-of-an-element-using-jquery
---
# --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<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。
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 `blue`(蓝色):
```js
$("#left-well").children().css("color", "blue")
```
# --instructions--
`right-well` 元素的所有子元素设置为橙色orange
# --hints--
`#right-well` 的所有子元素应该有橙色文本。
```js
assert($('#right-well').children().css('color') === 'rgb(255, 165, 0)');
```
应该用 `children()` 函数修改这些元素。
```js
assert(code.match(/\.children\(\)\.css/g));
```
应该仅用 jQuery 给标签添加 class。
```js
assert(code.match(/<div class="well" id="right-well">/g));
```
# --seed--
## --seed-contents--
```html
<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>
<!-- 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>
```
# --solutions--
```html
<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>
```