Files
freeCodeCamp/curriculum/challenges/chinese/03-front-end-development-libraries/jquery/change-text-inside-an-element-using-jquery.md
Shaun Hamilton c2a11ad00d feat: add 'back/front end' in curriculum (#42596)
* chore: rename APIs and Microservices to include "Backend" (#42515)

* fix typo

* fix typo

* undo change

* Corrected grammar mistake

Corrected a grammar mistake by removing a comma.

* change APIs and Microservices cert title

* update title

* Change APIs and Microservices certi title

* Update translations.json

* update title

* feat(curriculum): rename apis and microservices cert

* rename folder structure

* rename certificate

* rename learn Markdown

* apis-and-microservices -> back-end-development-and-apis

* update backend meta

* update i18n langs and cypress test

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* fix: add development to front-end libraries (#42512)

* fix: added-the-word-Development-to-front-end-libraries

* fix/added-the-word-Development-to-front-end-libraries

* fix/added-word-development-to-front-end-libraries-in-other-related-files

* fix/added-the-word-Development-to-front-end-and-all-related-files

* fix/removed-typos-from-last-commit-in-index.md

* fix/reverted-changes-that-i-made-to-dependecies

* fix/removed xvfg

* fix/reverted changes that i made to package.json

* remove unwanted changes

* front-end-development-libraries changes

* rename backend certSlug and README

* update i18n folder names and keys

* test: add legacy path redirect tests

This uses serve.json from the client-config repo, since we currently use
that in production

* fix: create public dir before moving serve.json

* fix: add missing script

* refactor: collect redirect tests

* test: convert to cy.location for stricter tests

* rename certificate folder to 00-certificates

* change crowdin config to recognise new certificates location

* allow translations to be used

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

* add forwards slashes to path redirects

* fix cypress path tests again

* plese cypress

* fix: test different challenge

Okay so I literally have no idea why this one particular challenge
fails in Cypress Firefox ONLY. Tom and I paired and spun a full build
instance and confirmed in Firefox the page loads and redirects as
expected. Changing to another bootstrap challenge passes Cypress firefox
locally. Absolutely boggled by this.

AAAAAAAAAAAAAAA

* fix: separate the test

Okay apparently the test does not work unless we separate it into
a different `it` statement.

>:( >:( >:( >:(

Co-authored-by: Sujal Gupta <55016909+heysujal@users.noreply.github.com>
Co-authored-by: Noor Fakhry <65724923+NoorFakhry@users.noreply.github.com>
Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
2021-08-13 21:57:13 -05:00

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Markdown

---
id: 564944c91be2204b269d51e3
title: 使用 jQuery 更改元素内部的文本
challengeType: 6
forumTopicId: 16773
dashedName: change-text-inside-an-element-using-jquery
---
# --description--
可以通过 jQuery 改变元素开始和结束标签之间的文本。 甚至改变 HTML 标签。
jQuery 有一个 `.html()` 函数,能用其在标签里添加 HTML 标签和文本, 函数提供的内容将完全替换之前标签的内容。
下面是重写并强调标题文本的代码:
```js
$("h3").html("<em>jQuery Playground</em>");
```
jQuery 还有一个类似的函数 `.text()`,可以在不添加标签的前提下改变标签内的文本。 换句话说,这个函数不会评估传递给它的任何 HTML 标记,而是将其视为要替换现有内容的文本。
给 id 为 `target4` 的按钮的文本添加强调效果。
查看这篇[关于 &lt;em> 的文章](https://www.freecodecamp.org/news/html-elements-explained-what-are-html-tags/#em-element)来了解更多 `<i>``<em>` 的区别和用法。
注意,`<i>` 标签虽然传统上用来强调文本,但此后常用作图标的标签。 `<em>` 标签作为强调标签现在已被广泛接受。 可以使用任意一种完成这个挑战。
# --hints--
应该通过添加 HTML 标签强调 `target4` 按钮中的文本。
```js
assert.isTrue(
/<em>|<i>\s*#target4\s*<\/em>|<\/i>/gi.test($('#target4').html())
);
```
文本应该保持不变。
```js
assert($('#target4') && $('#target4').text().trim() === '#target4');
```
不应该改变其它任何文本内容。
```js
assert.isFalse(/<em>|<i>/gi.test($('h3').html()));
```
应该使用 `.html()` 方法而不是 `.text()` 方法。
```js
assert(code.match(/\.html\(/g));
```
应该使用 jQuery 选取 `button id="target4"`
```js
assert(code.match(/\$\(\s*?(\"|\')#target4(\"|\')\s*?\)\.html\(/));
```
# --seed--
## --seed-contents--
```html
<script>
$(document).ready(function() {
$("#target1").css("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");
$("#target4").html('<em>#target4</em>');
});
</script>
<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>
```