CSS-根据背景更改文本颜色 [英] CSS - Change text color depending on background

问题描述

我有一个简单的布局，包括三个全高div和一个固定的标题栏.

I have a simple layout consisting of three full height divs and a fixed header bar.

body,html {
  padding:0;
  margin:0;
}

.header {
  position:fixed;
  width:100%;
  height:50px;
  color:white;
  margin:20px;
}

.section1 {
  background:black;
  height:100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color:white;
}

.section2 {
  background:white;
  height:100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section3 {
  background:black;
  height:100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color:white;
}

<div class="header">
  Header Content
</div>
<div class="wrapper">
  <div class="section1">
    Section One Content
  </div>
  <div class="section2">
    Section Two Content
  </div>
  <div class="section3">
    Section Three Content
  </div>
</div>

我试图使标题栏文本在具有白色背景的部分上滚动时变为黑色.

I am trying to make the header bar text colour change to black when it rolls over the section with the white background.

我已经看到了几个可以实现此目标的jQuery插件，但我正在尝试避免任何不必要的脚本.

I have seen a couple of jQuery plugins which should work to achieve this but I am trying to avoid any unnecessary scripts.

CSS mix-blend-mode函数是否可以实现这一目标?有没有人能举例说明他们可以实现类似的目标?

Would the CSS mix-blend-mode function allow me to achieve this? Does anybody have an example they can point me to of something similar being achieved?

推荐答案

您可以使用

You can use mix-blend-mode:difference

body,
html {
  padding: 0;
  margin: 0;
}

.header {
  position: fixed;
  width: 100%;
  height: 50px;
  margin: 20px;
  color:#fff;
  mix-blend-mode: difference;
}

.section1,
.section2,
.section3{
  background: black;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.section2 {
  background: white;
  color:#000;
}

<div class="header">
  Header Content
</div>
<div class="wrapper">
  <div class="section1">
    Section One Content
  </div>
  <div class="section2">
    Section Two Content
  </div>
  <div class="section3">
    Section Three Content
  </div>
</div>

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