IntersectionObserver（相交观察器）API在线实例演示

Intersection Observer API Demo （https://w3c.github.io/IntersectionObserver）

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HTML
CSS
JavaScript
Result

编译

JavaScript

const getThreshold = () => {
  let data = [];

for (let i = 0; i <= 1.0; i += 0.005) {
    data.push(i);
  }

return data;
}

const mountObserver = ({ target, handler, threshold }) => {
  const options = {
    root: null,
    rootMargin: '0px',
    threshold
  }

const observer = new IntersectionObserver(handler, options);

observer.observe(target);
}

const handleChanges = (entries) => {
  entries.forEach(({ target, intersectionRatio }) => {
    const element = target.querySelector('.percentage__value');
    const view = target.className.split(' ')[1];    
    const percentage = Math.ceil(intersectionRatio * 100);

element.firstChild.data = percentage;

scaleLegendBg({
      bg: document.querySelector(`.legend__item--${view}`).querySelector('.legend__bg'),
      percentage: percentage / 100
    })
  });
}

const scaleLegendBg = ({ bg, percentage }) => {
  bg.style.transform = `scaleX(${percentage})`;
};

编译

CSS

:root {
  --home-color: #423e6e;
  --about-color: #ffbf00;
  --contact-color: #2bdfbb;
  --services-color: #e24161;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto Mono', monospace;
  margin: 0;
  padding: 0;
}

.title {
  background-color: #ffffff;
  display: block;
  margin: 0;
  padding: 30px;
  position: -webkit-sticky;
  position: sticky;
  top: 0;
}

.view {
  color: #ffffff;
  height: 100vh;
  padding: 40px;
  position: relative;
  width: 100%;
}

.view__title {
  font-size: 30px;
  margin: 0;
  text-transform: uppercase;
}

.home ,
.legend__item--home .legend__bg {
  background-color: var(--home-color);
}

.about,
.legend__item--about .legend__bg {
  background-color: var(--about-color);
}

.contact,
.legend__item--contact .legend__bg {
  background-color: var(--contact-color);
}

.services,
.legend__item--services .legend__bg {
  background-color: var(--services-color);
}

.percentage {
  height: 200px;
  left: 50%;
  position: absolute;
  text-align: center;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 340px;
}

.percentage__value {
  font-size: 160px;
}

.percentage__extension {
  font-size: 50px;
}

.sub {
  display: block;
  font-size: 24px;
  letter-spacing: 2px;
}

.legend {
  background-color: #ffffff;
  bottom: 0;
  display: flex;
  flex-direction: row;
  height: 60px;
  justify-content: space-evenly;
  position: fixed;
  width: 100%;
  z-index: 1;
}

.legend__bg {
  display: block;
  height: 100%;
  position: absolute;
  top: 0;
  transform: scaleX(0);
  transform-origin: left;
  width: 100%;
  z-index: 2;
}

.legend__item {
  position: relative;
  text-align: center;
  width: 100%;
  box-shadow: 3px 1px 5px 0px rgba(0, 0, 0, 0.21);
}

.legend__title {
  position: relative;
  z-index: 3;
}

.legend__item--home {
  z-index: 10;
}

.legend__item--about {
  z-index: 9;
}

.legend__item--contact {
  z-index: 8;
}

.legend__item--services {
  z-index: 7;
}

HTML

<section class="legend">
  <div class="legend__item legend__item--home">
    <h3 class="legend__title">home</h3>
    <div class="legend__bg"></div>
  </div>
  <div class="legend__item legend__item--about">
    <h3 class="legend__title">about</h3>
    <div class="legend__bg"></div>
  </div>
  <div class="legend__item legend__item--contact">
    <h3 class="legend__title">contact</h3>
    <div class="legend__bg"></div>
  </div>
  <div class="legend__item legend__item--services">
    <h3 class="legend__title">services</h3>
    <div class="legend__bg"></div>
  </div>
</section>
<section class="view home">
  <h2 class="view__title">Home</h2>
  <div class="percentage">
    <span class="percentage__value">0</span>
    <span class="percentage__extension">%</span>
    <span class="sub">inside viewport</span>
  </div>
</section>
<section class="view about">
  <h2 class="view__title">About</h2>
  <div class="percentage">
    <span class="percentage__value">0</span>
    <span class="percentage__extension">%</span>
    <span class="sub">inside viewport</span>
  </div>
</section>
<section class="view contact">
  <h2 class="view__title">Contact</h2>
  <div class="percentage">
    <span class="percentage__value">0</span>
    <span class="percentage__extension">%</span>
    <span class="sub">inside viewport</span>
  </div>
</section>
<section class="view services">
  <h2 class="view__title">Services</h2>
  <div class="percentage">
    <span class="percentage__value">0</span>
    <span class="percentage__extension">%</span>
    <span class="sub">inside viewport</span>
  </div>
</section>

Intersection Observer API Demo （https://w3c.github.io/IntersectionObserver）

h5, api, demo

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Intersection Observer API Demo （https://w3c.github.io/IntersectionObserver）

h5, api, demo

HTML5 Web音频应用程序接口（Web Audio API）实例：在线演奏木琴

gsap和svg filter实现乱流（turbulence）加载动画

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