使用 javascript 更改滚动条的背景颜色

Question

https://codepen.io/tobiasthaden/pen/OVWKjm


$(window).scroll(function() {
  $('section').each(function(i) {
    if ($(this).position().top <= $(window).scrollTop()) {
      $('body').css('background-color', $(this).attr('data-color'));
    }
  });
});

希望使用常规的旧 javascript 复制这种效果。我不想使用 jQuery!

有什么建议吗？

Answer 1

    const sections = document.querySelectorAll('section')
    
    window.addEventListener('scroll', function() {
        sections.forEach(section => {
            const distFromTop = document.body.scrollTop + section.getBoundingClientRect().top
            if (distFromTop < 10) {
                document.body.style.background = section.dataset.color
            }
        })
    })

        body {
            transition: background-color .2s ease;
        }

        section {
            height: 100vh;
        }

    <section data-color="white"></section>
    <section data-color="green"></section>
    <section data-color="purple"></section>
    <section data-color="yellow"></section>
    <section data-color="blue"></section>
    <section data-color="white"></section>

这看起来效果不错！

Answer 2

我会这样做的。

const sections = document.querySelectorAll('section')

document.addEventListener('scroll', () => {
  sections.forEach(section => {
    if(section.getBoundingClientRect().top <= document.body.scrollTop) {
      document.body.style.background = section.dataset.color
    }    
  })
})

body {
  transition: background-color .2s ease;
}

section {
  height: 100vh;
}

<section data-color="white"></section>
<section data-color="green"></section>
<section data-color="purple"></section>
<section data-color="yellow"></section>
<section data-color="blue"></section>
<section data-color="white"></section>

使用 javascript 更改滚动条的背景颜色

Changing background color on scroll with javascript

javascript

scroll

colors

background

sections