在鼠标Y上的两种背景颜色之间切换+使<p>适应新颜色

Question

我找到了一段代码，它几乎可以做我想要的事情，除了我希望它是水平的/基于鼠标Y而不是X。现在我知道在js中X将被更改为Y，但是我很难旋转div。

另外，如果我想把一些文本放在上面，我该怎么做才能让背景改变影响文本的颜色(例如，如果文本是黑色的，背景的一半是黑色的，以确保当黑色背景覆盖文本时，文本颜色会变为另一种颜色或反转？

此外，我还尝试在js中找出哪一部分决定了鼠标移动的响应性，也就是说，如何才能使颜色转换不会滞后于鼠标，但我搞不清楚？

https://codepen.io/erutuf/pen/NJLwqV

haml

    #banner-wrapper.banner-wrapper
  .banner.design
    .banner-content

  .banner.dev
    .banner-content

scss

   body {
  margin: 0;
  padding: 0;

  .banner-wrapper {
    position: relative;
    width: 100%;
    height: 400px;
    overflow: hidden; background:red;
  }

  .banner {
    position: absolute;
    overflow: hidden;

    &.dev {
      margin-left: -500px;
      width: calc(50vw + 500px);
      .banner-content {
        margin-left: 500px; background:black;
      }
    }
    .banner-content {
      height: 400px;
    }
    img {
      width: 100vw;
    }
  }
}

js

document.addEventListener('DOMContentLoaded', function(){
    let banner = document.getElementById('banner-wrapper');
    let devLayer = banner.querySelector('.dev');
    let delta = 0;

    banner.addEventListener('mousemove', function(e){
        delta = (e.clientX - window.innerWidth / 2) * 0.5;
        devLayer.style.width = e.clientX + 500 + delta + 'px';
    });
})

Answer 1

您可以使用JS + CSS。以下代码可以作为您的起点:)。

顺便说一句，我正在改编你的链接https://codepen.io/erutuf/pen/NJLwqV的代码

​

document.addEventListener("DOMContentLoaded", function(){
    let banner = document.getElementById("banner-wrapper");
    let devLayer = banner.querySelector(".dev");
    let delta = 0;
    // play with div's height
    banner.addEventListener("mousemove", function(e){
        delta = (e.clientY - window.innerHeight / 2) * 0.5;
        devLayer.style.height = e.clientY + delta + "px";
    });
})

<div class="banner-wrapper" id="banner-wrapper">
  <div class="banner design">
    <div class="banner-content">BANNER TEXT</div>
  </div>
  <div class="banner dev">
    <div class="banner-content"></div>
  </div>
</div>

<style type="text/css">
body {
  margin: 0;
  padding: 0;
}
body .banner-wrapper {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: red;
}
body .banner {
  position: absolute;
  overflow: hidden;
}
body .banner.dev {
  width: 100%;
  /* play with responsiveness here. note that 0.1 is more responsive than 0.5. more info : https://www.w3schools.com/css/css3_transitions.asp */
  -webkit-transition: height 0.2s linear;
  transition: height 0.2s ease;
}
body .banner.dev .banner-content {
  background: black;
}
body .banner .banner-content {
  height: 400px;
}
body .banner img {
  width: 100%;
}
.banner.design {
    margin-top: -25px;
    height: 50px;
    top: 50%;
    font-size: 50px;
	/* set color & mix-blend-mode for text color vs background color effect. more info : https://css-tricks.com/methods-contrasting-text-backgrounds/ */
    mix-blend-mode: difference;
    color: #fff;
    z-index: 1;
    margin-left: -175px;
    left: 50%;
    width: 350px;
}

</style>

​