Vue.jsでユーザーエージェントを使ってみよう

![vue.jpeg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/665011/24528fe8-8e4f-4587-7760-3716e39bc0a2.jpeg)

Vue.jsのチュートリアルを兼ねてユーザーエージェントを実装します。

本記事ではOSごとにボタンの表示を変えていきます。

####テンプレートの準備

https://startbootstrap.com/themes/creative/ にアクセスし、テンプレートをダウンロードします。

ダウンロードが終わったら、Zipファイルを解凍し、好きなテキストエディタで開きます。

index.htmlを編集します。

```HTML:index.html
<!DOCTYPE html>
<html lang="ja">
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
        <meta name="description" content="" />
        <meta name="author" content="" />
        <title>Vue.jsでユーザーエージェントを使ってみよう</title>
        <link rel="icon" type="image/x-icon" href="assets/img/favicon.ico" />
        <!-- Font Awesome icons (free version)-->
        <script src="https://use.fontawesome.com/releases/v5.13.0/js/all.js" crossorigin="anonymous"></script>
        <!-- Google fonts-->
        <link href="https://fonts.googleapis.com/css?family=Montserrat:400,700" rel="stylesheet" type="text/css" />
        <link href="https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic,700italic" rel="stylesheet" type="text/css" />
        <link href="https://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700" rel="stylesheet" type="text/css" />
        <!-- Core theme CSS (includes Bootstrap)-->
        <link href="css/styles.css" rel="stylesheet" />
    </head>
    <body id="page-top">
        <!-- Navigation-->
        <nav class="navbar navbar-expand-lg navbar-dark fixed-top" id="mainNav">
            <div class="container">
                <a class="navbar-brand js-scroll-trigger" href="#page-top"><img src="assets/img/navbar-logo.svg" alt="" /></a>
                <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
                    Menu
                    <i class="fas fa-bars ml-1"></i>
                </button>
                <div class="collapse navbar-collapse" id="navbarResponsive">
                    <ul class="navbar-nav text-uppercase ml-auto">
                        <li class="nav-item"><a class="nav-link js-scroll-trigger" href="#services">Services</a></li>
                        <li class="nav-item"><a class="nav-link js-scroll-trigger" href="#portfolio">Portfolio</a></li>
                        <li class="nav-item"><a class="nav-link js-scroll-trigger" href="#about">About</a></li>
                        <li class="nav-item"><a class="nav-link js-scroll-trigger" href="#team">Team</a></li>
                        <li class="nav-item"><a class="nav-link js-scroll-trigger" href="#contact">Contact</a></li>
                    </ul>
                </div>
            </div>
        </nav>
        <!-- Masthead-->
        <header class="masthead">
            <div class="container">
                <div class="masthead-subheading">Welcome To Our Studio!</div>
                <div class="masthead-heading text-uppercase">User Agent</div>
                <a class="btn btn-info btn-xl text-uppercase js-scroll-trigger" href="#services">Windows</a>
                <a class="btn btn-primary btn-xl text-uppercase js-scroll-trigger" href="#services">Mac</a>
            </div>
        </header>
        <!-- Services-->
        <section class="page-section" id="services">
            <div class="container">
                <div class="text-center">
                    <h2 class="section-heading text-uppercase">Services</h2>
                    <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur.</h3>
                </div>
                <div class="row text-center">
                    <div class="col-md-4">
                        <span class="fa-stack fa-4x">
                            <i class="fas fa-circle fa-stack-2x text-primary"></i>
                            <i class="fas fa-shopping-cart fa-stack-1x fa-inverse"></i>
                        </span>
                        <h4 class="my-3">E-Commerce</h4>
                        <p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minima maxime quam architecto quo inventore harum ex magni, dicta impedit.</p>
                    </div>
                    <div class="col-md-4">
                        <span class="fa-stack fa-4x">
                            <i class="fas fa-circle fa-stack-2x text-primary"></i>
                            <i class="fas fa-laptop fa-stack-1x fa-inverse"></i>
                        </span>
                        <h4 class="my-3">Responsive Design</h4>
                        <p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minima maxime quam architecto quo inventore harum ex magni, dicta impedit.</p>
                    </div>
                    <div class="col-md-4">
                        <span class="fa-stack fa-4x">
                            <i class="fas fa-circle fa-stack-2x text-primary"></i>
                            <i class="fas fa-lock fa-stack-1x fa-inverse"></i>
                        </span>
                        <h4 class="my-3">Web Security</h4>
                        <p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minima maxime quam architecto quo inventore harum ex magni, dicta impedit.</p>
                    </div>
                </div>
            </div>
        </section>
        <!-- Portfolio Grid-->
        <section class="page-section bg-light" id="portfolio">
            <div class="container">
                <div class="text-center">
                    <h2 class="section-heading text-uppercase">Portfolio</h2>
                    <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur.</h3>
                </div>
                <div class="row">
                    <div class="col-lg-4 col-sm-6 mb-4">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal1">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/01-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Threads</div>
                                <div class="portfolio-caption-subheading text-muted">Illustration</div>
                            </div>
                        </div>
                    </div>
                    <div class="col-lg-4 col-sm-6 mb-4">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal2">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/02-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Explore</div>
                                <div class="portfolio-caption-subheading text-muted">Graphic Design</div>
                            </div>
                        </div>
                    </div>
                    <div class="col-lg-4 col-sm-6 mb-4">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal3">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/03-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Finish</div>
                                <div class="portfolio-caption-subheading text-muted">Identity</div>
                            </div>
                        </div>
                    </div>
                    <div class="col-lg-4 col-sm-6 mb-4 mb-lg-0">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal4">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/04-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Lines</div>
                                <div class="portfolio-caption-subheading text-muted">Branding</div>
                            </div>
                        </div>
                    </div>
                    <div class="col-lg-4 col-sm-6 mb-4 mb-sm-0">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal5">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/05-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Southwest</div>
                                <div class="portfolio-caption-subheading text-muted">Website Design</div>
                            </div>
                        </div>
                    </div>
                    <div class="col-lg-4 col-sm-6">
                        <div class="portfolio-item">
                            <a class="portfolio-link" data-toggle="modal" href="#portfolioModal6">
                                <div class="portfolio-hover">
                                    <div class="portfolio-hover-content"><i class="fas fa-plus fa-3x"></i></div>
                                </div>
                                <img class="img-fluid" src="assets/img/portfolio/06-thumbnail.jpg" alt="" />
                            </a>
                            <div class="portfolio-caption">
                                <div class="portfolio-caption-heading">Window</div>
                                <div class="portfolio-caption-subheading text-muted">Photography</div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>
        <!-- About-->
        <section class="page-section" id="about">
            <div class="container">
                <div class="text-center">
                    <h2 class="section-heading text-uppercase">About</h2>
                    <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur.</h3>
                </div>
                <ul class="timeline">
                    <li>
                        <div class="timeline-image"><img class="rounded-circle img-fluid" src="assets/img/about/1.jpg" alt="" /></div>
                        <div class="timeline-panel">
                            <div class="timeline-heading">
                                <h4>2009-2011</h4>
                                <h4 class="subheading">Our Humble Beginnings</h4>
                            </div>
                            <div class="timeline-body"><p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sunt ut voluptatum eius sapiente, totam reiciendis temporibus qui quibusdam, recusandae sit vero unde, sed, incidunt et ea quo dolore laudantium consectetur!</p></div>
                        </div>
                    </li>
                    <li class="timeline-inverted">
                        <div class="timeline-image"><img class="rounded-circle img-fluid" src="assets/img/about/2.jpg" alt="" /></div>
                        <div class="timeline-panel">
                            <div class="timeline-heading">
                                <h4>March 2011</h4>
                                <h4 class="subheading">An Agency is Born</h4>
                            </div>
                            <div class="timeline-body"><p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sunt ut voluptatum eius sapiente, totam reiciendis temporibus qui quibusdam, recusandae sit vero unde, sed, incidunt et ea quo dolore laudantium consectetur!</p></div>
                        </div>
                    </li>
                    <li>
                        <div class="timeline-image"><img class="rounded-circle img-fluid" src="assets/img/about/3.jpg" alt="" /></div>
                        <div class="timeline-panel">
                            <div class="timeline-heading">
                                <h4>December 2012</h4>
                                <h4 class="subheading">Transition to Full Service</h4>
                            </div>
                            <div class="timeline-body"><p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sunt ut voluptatum eius sapiente, totam reiciendis temporibus qui quibusdam, recusandae sit vero unde, sed, incidunt et ea quo dolore laudantium consectetur!</p></div>
                        </div>
                    </li>
                    <li class="timeline-inverted">
                        <div class="timeline-image"><img class="rounded-circle img-fluid" src="assets/img/about/4.jpg" alt="" /></div>
                        <div class="timeline-panel">
                            <div class="timeline-heading">
                                <h4>July 2014</h4>
                                <h4 class="subheading">Phase Two Expansion</h4>
                            </div>
                            <div class="timeline-body"><p class="text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sunt ut voluptatum eius sapiente, totam reiciendis temporibus qui quibusdam, recusandae sit vero unde, sed, incidunt et ea quo dolore laudantium consectetur!</p></div>
                        </div>
                    </li>
                    <li class="timeline-inverted">
                        <div class="timeline-image">
                            <h4>
                                Be Part
                                <br />
                                Of Our
                                <br />
                                Story!
                            </h4>
                        </div>
                    </li>
                </ul>
            </div>
        </section>
        <!-- Team-->
        <section class="page-section bg-light" id="team">
            <div class="container">
                <div class="text-center">
                    <h2 class="section-heading text-uppercase">Our Amazing Team</h2>
                    <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur.</h3>
                </div>
                <div class="row">
                    <div class="col-lg-4">
                        <div class="team-member">
                            <img class="mx-auto rounded-circle" src="assets/img/team/1.jpg" alt="" />
                            <h4>Kay Garland</h4>
                            <p class="text-muted">Lead Designer</p>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-twitter"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-facebook-f"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-linkedin-in"></i></a>
                        </div>
                    </div>
                    <div class="col-lg-4">
                        <div class="team-member">
                            <img class="mx-auto rounded-circle" src="assets/img/team/2.jpg" alt="" />
                            <h4>Larry Parker</h4>
                            <p class="text-muted">Lead Marketer</p>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-twitter"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-facebook-f"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-linkedin-in"></i></a>
                        </div>
                    </div>
                    <div class="col-lg-4">
                        <div class="team-member">
                            <img class="mx-auto rounded-circle" src="assets/img/team/3.jpg" alt="" />
                            <h4>Diana Petersen</h4>
                            <p class="text-muted">Lead Developer</p>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-twitter"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-facebook-f"></i></a>
                            <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-linkedin-in"></i></a>
                        </div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-lg-8 mx-auto text-center"><p class="large text-muted">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut eaque, laboriosam veritatis, quos non quis ad perspiciatis, totam corporis ea, alias ut unde.</p></div>
                </div>
            </div>
        </section>
        <!-- Clients-->
        <div class="py-5">
            <div class="container">
                <div class="row">
                    <div class="col-md-3 col-sm-6 my-3">
                        <a href="#!"><img class="img-fluid d-block mx-auto" src="assets/img/logos/envato.jpg" alt="" /></a>
                    </div>
                    <div class="col-md-3 col-sm-6 my-3">
                        <a href="#!"><img class="img-fluid d-block mx-auto" src="assets/img/logos/designmodo.jpg" alt="" /></a>
                    </div>
                    <div class="col-md-3 col-sm-6 my-3">
                        <a href="#!"><img class="img-fluid d-block mx-auto" src="assets/img/logos/themeforest.jpg" alt="" /></a>
                    </div>
                    <div class="col-md-3 col-sm-6 my-3">
                        <a href="#!"><img class="img-fluid d-block mx-auto" src="assets/img/logos/creative-market.jpg" alt="" /></a>
                    </div>
                </div>
            </div>
        </div>
        <!-- Contact-->
        <section class="page-section" id="contact">
            <div class="container">
                <div class="text-center">
                    <h2 class="section-heading text-uppercase">Contact Us</h2>
                    <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur.</h3>
                </div>
                <form id="contactForm" name="sentMessage" novalidate="novalidate">
                    <div class="row align-items-stretch mb-5">
                        <div class="col-md-6">
                            <div class="form-group">
                                <input class="form-control" id="name" type="text" placeholder="Your Name *" required="required" data-validation-required-message="Please enter your name." />
                                <p class="help-block text-danger"></p>
                            </div>
                            <div class="form-group">
                                <input class="form-control" id="email" type="email" placeholder="Your Email *" required="required" data-validation-required-message="Please enter your email address." />
                                <p class="help-block text-danger"></p>
                            </div>
                            <div class="form-group mb-md-0">
                                <input class="form-control" id="phone" type="tel" placeholder="Your Phone *" required="required" data-validation-required-message="Please enter your phone number." />
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="form-group form-group-textarea mb-md-0">
                                <textarea class="form-control" id="message" placeholder="Your Message *" required="required" data-validation-required-message="Please enter a message."></textarea>
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                    </div>
                    <div class="text-center">
                        <div id="success"></div>
                        <button class="btn btn-primary btn-xl text-uppercase" id="sendMessageButton" type="submit">Send Message</button>
                    </div>
                </form>
            </div>
        </section>
        <!-- Footer-->
        <footer class="footer py-4">
            <div class="container">
                <div class="row align-items-center">
                    <div class="col-lg-4 text-lg-left">Copyright © Your Website 2020</div>
                    <div class="col-lg-4 my-3 my-lg-0">
                        <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-twitter"></i></a>
                        <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-facebook-f"></i></a>
                        <a class="btn btn-dark btn-social mx-2" href="#!"><i class="fab fa-linkedin-in"></i></a>
                    </div>
                    <div class="col-lg-4 text-lg-right">
                        <a class="mr-3" href="#!">Privacy Policy</a>
                        <a href="#!">Terms of Use</a>
                    </div>
                </div>
            </div>
        </footer>
        <!-- Portfolio Modals-->
        <!-- Modal 1-->
        <div class="portfolio-modal modal fade" id="portfolioModal1" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/01-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Threads</li>
                                        <li>Category: Illustration</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal 2-->
        <div class="portfolio-modal modal fade" id="portfolioModal2" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/02-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Explore</li>
                                        <li>Category: Graphic Design</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal 3-->
        <div class="portfolio-modal modal fade" id="portfolioModal3" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/03-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Finish</li>
                                        <li>Category: Identity</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal 4-->
        <div class="portfolio-modal modal fade" id="portfolioModal4" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/04-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Lines</li>
                                        <li>Category: Branding</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal 5-->
        <div class="portfolio-modal modal fade" id="portfolioModal5" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/05-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Southwest</li>
                                        <li>Category: Website Design</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal 6-->
        <div class="portfolio-modal modal fade" id="portfolioModal6" tabindex="-1" role="dialog" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="close-modal" data-dismiss="modal"><img src="assets/img/close-icon.svg" alt="Close modal" /></div>
                    <div class="container">
                        <div class="row justify-content-center">
                            <div class="col-lg-8">
                                <div class="modal-body">
                                    <!-- Project Details Go Here-->
                                    <h2 class="text-uppercase">Project Name</h2>
                                    <p class="item-intro text-muted">Lorem ipsum dolor sit amet consectetur.</p>
                                    <img class="img-fluid d-block mx-auto" src="assets/img/portfolio/06-full.jpg" alt="" />
                                    <p>Use this area to describe your project. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Est blanditiis dolorem culpa incidunt minus dignissimos deserunt repellat aperiam quasi sunt officia expedita beatae cupiditate, maiores repudiandae, nostrum, reiciendis facere nemo!</p>
                                    <ul class="list-inline">
                                        <li>Date: January 2020</li>
                                        <li>Client: Window</li>
                                        <li>Category: Photography</li>
                                    </ul>
                                    <button class="btn btn-primary" data-dismiss="modal" type="button">
                                        <i class="fas fa-times mr-1"></i>
                                        Close Project
                                    </button>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- Bootstrap core JS-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
        <!-- Third party plugin JS-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.4.1/jquery.easing.min.js"></script>
        <!-- Contact form JS-->
        <script src="assets/mail/jqBootstrapValidation.js"></script>
        <script src="assets/mail/contact_me.js"></script>
        <!-- Core theme JS-->
        <script src="js/scripts.js"></script>
    </body>
</html>
```

index.htmlをブラウザに表示します。

![img1.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/665011/b9f25b5f-4eb3-b9b7-5506-122c7f2eef1f.png)

上の画面のように表示されれば、テンプレートの準備は完了です。

####Vue.jsの導入

index.htmlのbodyの終了タグの上にコードを追加します。

```HTML:index.html
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
        <script>
        //ここにVue.jsのコードを記述する
        </script>
```

次にheaderの開始タグ内にid="app"と記述します。

```HTML:index.html
<header id="app" class="masthead">
```

scriptタグ内にコードを記述します。

```HTML:index.html
<script>
  let app = new Vue({
    el: "#app",
    data: {
      value: false,
    }
  })
</script>
```

次にWindowsボタンにv-ifを記述します。

```HTML:index.html
<a v-if="value" class="btn btn-info btn-xl text-uppercase js-scroll-trigger" href="#services">Windows</a>
```

ブラウザを更新します。

![img2.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/665011/8c42f4d5-efc3-ea9d-3d80-d15c202eada2.png)

上の画面のように表示されれば、Vue.jsの導入は完了です。

####ユーザーエージェントの利用

scriptタグ内を編集します。

```HTML:index.html
<script>
  let app = new Vue({
    el: "#app",
    methods: {
      isntPlatform: function(platform) {
        let agent = navigator.userAgent.toLowerCase()
        return agent.indexOf(platform) === -1
      }
    }
  })
</script>
```

次にWindowsボタンとMacボタンにv-ifを記述します。

```HTML:index.html
<a v-if="isntPlatform('mac')" class="btn btn-info btn-xl text-uppercase js-scroll-trigger" href="#services">Windows</a>
<a v-if="isntPlatform('windows')" class="btn btn-primary btn-xl text-uppercase js-scroll-trigger" href="#services">Mac</a>
```

ブラウザを更新します。

Google Chromeを使っている方は、デベロッパーツールでOSごとに表示が変わるかどうか確認してみてください。

Windowの場合

![img3.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/665011/76c903f9-988f-622c-a34d-8664cf923359.png)

MacOSの場合

![img4.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/665011/0f49d81b-494b-0ef4-d693-91b8f242b377.png)

これでVue.jsにおけるユーザーエージェントの実装は完了です。

ソースコードが見たい方は[こちら](https://github.com/takahashitakuya031126/user_agent)で確認できます。