在 JS 中，为什么 event.target 根据它是在模板文字中还是添加到字符串中给出不同的结果

Question

我在听关于 JS 的讲座时，我们创建了一个随机数生成器，然后用它来创建一个随机 rgb 颜色函数。

然后我们将事件监听器添加到 DOM 中的 link 元素，在回调中我们有一个 console.log 和颜色生成器调用。

在这个console.log中我使用了第一个模板文字到post event.target，然后我再次在模板文字之外post event.target.

所以我的问题是：为什么模板文字中的 event.target post 是 link 到 .../index.html#section-1 而 post 被点击的元素之外的那一个？

这里发生了什么让他们给出不同的结果？我通常只是在 post 时使用模板文字来安慰，但我现在必须重新考虑这种做法，因为它似乎有所不同。

点击功能 link 看看我在说什么。

const randomNumber = (min, max) => Math.floor(Math.random() * max) + min;

const randomColor = () =>
  `rgb(${randomNumber(0, 255)},${randomNumber(0, 255)},${randomNumber(
    0,
    255
  )})`;

document.querySelector('.nav__link').addEventListener('click', function (e) {
  console.log(`link\n ${e.target}\n`, e.target);
  this.style.backgroundColor = randomColor();
});

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <link rel="shortcut icon" type="image/png" href="img/icon.png" />

    <link
      href="https://fonts.googleapis.com/css?family=Poppins:300,400,500,600&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="style.css" />
    <title>page</title>
  </head>
  <body>
    <header class="header">
      <nav class="nav">
        <img
          src="img/logo.png"
          alt="logo"
          class="nav__logo"
          id="logo"
          designer="JS"
          data-version-number="3.0"
        />
        <ul class="nav__links">
          <li class="nav__item">
            <a class="nav__link" href="#section--1">Features</a>
          </li>
          <li class="nav__item">
            <a class="nav__link" href="#section--2">Operations</a>
          </li>
          <li class="nav__item">
            <a class="nav__link" href="#section--3">Testimonials</a>
          </li>
          <li class="nav__item">
            <a class="nav__link nav__link--btn btn--show-modal" href="#"
              >Open account</a
            >
          </li>
        </ul>
      </nav>

      <div class="header__title">
        <h1>
          h1
        </h1>
        <h4>h4</h4>
        <button class="btn--text btn--scroll-to">Learn more &DownArrow;</button>
        <img
          src="img/hero.png"
          class="header__img"
          alt="items"
        />
      </div>
    </header>

    <section class="section" id="section--1">
      <div class="section__title">
        <h2 class="section__description">Features</h2>
        <h3 class="section__header">
          h3.
        </h3>
      </div>

      <div class="features">
        <img
          src="img/digital-lazy.jpg"
          data-src="img/digital.jpg"
          alt="Computer"
          class="features__img lazy-img"
        />
        <div class="features__feature">
          <div class="features__icon">
            <svg>
              <use xlink:href="img/icons.svg#icon-monitor"></use>
            </svg>
          </div>
          <h5 class="features__header">100% digital </h5>
          <p>
            Lorem ipsum dolor sit amet consectetur adipisicing elit. Unde alias
            sint quos? Accusantium a fugiat porro reiciendis saepe quibusdam
            debitis ducimus.
          </p>
        </div>

        <div class="features__feature">
          <div class="features__icon">
            <svg>
              <use xlink:href="img/icons.svg#icon-trending-up"></use>
            </svg>
          </div>
          <h5 class="features__header">Some text</h5>
          <p>
            Nesciunt quos autem dolorum voluptates cum dolores dicta fuga
            inventore ab? Nulla incidunt eius numquam sequi iste pariatur
            quibusdam!
          </p>
        </div>
        <img
          src="img/grow-lazy.jpg"
          data-src="img/grow.jpg"
          alt="Plant"
          class="features__img lazy-img"
        />

        <img
          src="img/card-lazy.jpg"
          data-src="img/card.jpg"
          alt="Credit card"
          class="features__img lazy-img"
        />
        <div class="features__feature">
          <div class="features__icon">
            <svg>
              <use xlink:href="img/icons.svg#icon-credit-card"></use>
            </svg>
          </div>
          <h5 class="features__header">Some text</h5>
          <p>
            Quasi, fugit in cumque cupiditate reprehenderit debitis animi enim
            eveniet consequatur odit quam quos possimus assumenda dicta fuga
            inventore ab.
          </p>
        </div>
      </div>
    </section>

    <section class="section" id="section--2">
      <div class="section__title">
        <h2 class="section__description">Operations</h2>
        <h3 class="section__header">
          Everything as simple as possible, but no simpler.
        </h3>
      </div>

      <div class="operations">
        <div class="operations__tab-container">
          <button
            class="
              btn
              operations__tab operations__tab--1 operations__tab--active
            "
            data-tab="1"
          >
            <span>01</span>Instant 
          </button>
          <button class="btn operations__tab operations__tab--2" data-tab="2">
            <span>02</span>Instant2
          </button>
          <button class="btn operations__tab operations__tab--3" data-tab="3">
            <span>03</span>Instant2
          </button>
        </div>
        <div
          class="
            operations__content
            operations__content--1
            operations__content--active
          "
        >
          <div class="operations__icon operations__icon--1">
            <svg>
              <use xlink:href="img/icons.svg#icon-upload"></use>
            </svg>
          </div>
          <h5 class="operations__header">
             no BS.
          </h5>
          <p>
            Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
            eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim
            ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
            aliquip ex ea commodo consequat.
          </p>
        </div>

        <div class="operations__content operations__content--2">
          <div class="operations__icon operations__icon--2">
            <svg>
              <use xlink:href="img/icons.svg#icon-home"></use>
            </svg>
          </div>
          <h5 class="operations__header">
            Buy a home or make your dreams come true.
          </h5>
          <p>
            Duis aute irure dolor in reprehenderit in voluptate velit esse
            cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
            cupidatat non proident, sunt in culpa qui officia deserunt mollit
            anim id est laborum.
          </p>
        </div>
        <div class="operations__content operations__content--3">
          <div class="operations__icon operations__icon--3">
            <svg>
              <use xlink:href="img/icons.svg#icon-user-x"></use>
            </svg>
          </div>
          <h5 class="operations__header">
            No longer need? No problem!
          </h5>
          <p>
            Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
            officia deserunt mollit anim id est laborum. Ut enim ad minim
            veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex
            ea commodo consequat.
          </p>
        </div>
      </div>
    </section>

    <section class="section" id="section--3">
      <div class="section__title section__title--testimonials">
        <h2 class="section__description">Not sure yet?</h2>
        <h3 class="section__header">
          Making their lifes simpler.
        </h3>
      </div>

      <div class="slider">
        <div class="slide slide--1">
          <div class="testimonial">
            <h5 class="testimonial__header">Best decision ever!</h5>
            <blockquote class="testimonial__text">
              Lorem ipsum dolor sit, amet consectetur adipisicing elit.
              Accusantium quas quisquam non? Quas voluptate nulla minima
              deleniti optio ullam nesciunt, numquam corporis et asperiores
              laboriosam sunt, praesentium suscipit blanditiis. Necessitatibus
              id alias reiciendis, perferendis facere pariatur dolore veniam
              autem esse non voluptatem saepe provident nihil molestiae.
            </blockquote>
            <address class="testimonial__author">
              <img src="img/user-1.jpg" alt="" class="testimonial__photo" />
              <h6 class="testimonial__name">Aarav Lynn</h6>
              <p class="testimonial__location">San Francisco, USA</p>
            </address>
          </div>
        </div>

        <div class="slide slide--2">
          <div class="testimonial">
            <h5 class="testimonial__header">
              The last step to becoming a complete minimalist
            </h5>
            <blockquote class="testimonial__text">
              Quisquam itaque deserunt ullam, quia ea repellendus provident,
              ducimus neque ipsam modi voluptatibus doloremque, corrupti
              laborum. Incidunt numquam perferendis veritatis neque repellendus.
              Lorem, ipsum dolor sit amet consectetur adipisicing elit. Illo
              deserunt exercitationem deleniti.
            </blockquote>
            <address class="testimonial__author">
              <img src="img/user-2.jpg" alt="" class="testimonial__photo" />
              <h6 class="testimonial__name">Miyah Miles</h6>
              <p class="testimonial__location">London, UK</p>
            </address>
          </div>
        </div>

        <div class="slide slide--3">
          <div class="testimonial">
            <h5 class="testimonial__header">
              Finally free
            </h5>
            <blockquote class="testimonial__text">
              Debitis, nihil sit minus suscipit magni aperiam vel tenetur
              incidunt commodi architecto numquam omnis nulla autem,
              necessitatibus blanditiis modi similique quidem. Odio aliquam
              culpa dicta beatae quod maiores ipsa minus consequatur error sunt,
              deleniti saepe aliquid quos inventore sequi. Necessitatibus id
              alias reiciendis, perferendis facere.
            </blockquote>
            <address class="testimonial__author">
              <img src="img/user-3.jpg" alt="" class="testimonial__photo" />
              <h6 class="testimonial__name">Francisco Gomes</h6>
              <p class="testimonial__location">Lisbon, Portugal</p>
            </address>
          </div>
        </div>

        <button class="slider__btn slider__btn--left">&larr;</button>
        <button class="slider__btn slider__btn--right">&rarr;</button>
        <div class="dots"></div>
      </div>
    </section>

    <section class="section section--sign-up">
      <div class="section__title">
        <h3 class="section__header">
          The best day to join was one year ago. The second best is
          today!
        </h3>
      </div>
      <button class="btn btn--show-modal">Open your account today!</button>
    </section>

    <footer class="footer">
      <ul class="footer__nav">
        <li class="footer__item">
          <a class="footer__link" href="#">About</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Pricing</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Terms of Use</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Privacy Policy</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Careers</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Blog</a>
        </li>
        <li class="footer__item">
          <a class="footer__link" href="#">Contact Us</a>
        </li>
      </ul>
      <img src="img/icon.png" alt="Logo" class="footer__logo" />
      <p class="footer__copyright">
        &copy; Copyright by
      </p>
    </footer>

    <div class="modal hidden">
      <button class="btn--close-modal">&times;</button>
      <h2 class="modal__header">
        Open your account <br />
        in just <span class="highlight">5 minutes</span>
      </h2>
      <form class="modal__form">
        <label>First Name</label>
        <input type="text" />
        <label>Last Name</label>
        <input type="text" />
        <label>Email Address</label>
        <input type="email" />
        <button class="btn">Next step &rarr;</button>
      </form>
    </div>
    <div class="overlay hidden"></div>

    <script src="script.js"></script>
  </body>
</html>

Answer 1

就是e.target和e.target的区别.toString()

这就是当您将字符串连接到具有 toString 的对象时 console.log 的工作方式 - 有时您会得到 yourString [object Object]

const randomNumber = (min, max) => Math.floor(Math.random() * max) + min;

const randomColor = () =>
  `rgb(${randomNumber(0, 255)},${randomNumber(0, 255)},${randomNumber(
    0,
    255
  )})`;

document.querySelector('.nav__link').addEventListener('click', function(e) {
console.log(e.target,e.target.toString())
  console.log(`link\n ${e.target}\n`, e.target);
  this.style.backgroundColor = randomColor();
});

<a class="nav__link" href="#section--1">Features</a>

在 JS 中，为什么 event.target 根据它是在模板文字中还是添加到字符串中给出不同的结果

in JS why does event.target give different results based on if its in a template literal or added to the string

javascript

target

dom-events

template-literals