反转彩色文本相关背景 [英] Invert colored text related background

问题描述

我想根据文本背景来反转文本颜色，如下图所示:.

I want to invert text color based on the background of the text, like in this image: .

所以我尝试了以下代码，但是没有用:

So I've tried the following code, but it didn't work:

#warp,
#text,
#tri {
  position: absolute;
  top: 0;
  left: 0;
  width: 150px;
  height: 150px;
  z-index: 1;
}

#warp {
  background-color: orange;
}

#text {
  text-align: center;
  z-index: 3;
}

#text h1 {
  margin: 0;
  line-height: 150px;
  mix-blend-mode: difference;
}

#tri {
  background-color: black;
  clip-path: polygon(0 0, 0 100%, 99.8% 150px);
  -webkit-clip-path: polygon(0 0, 0 100%, 99.8% 150px);
  z-index: 2;
}

<div id="warp">
  <div id="text">
    <h1>TEXT</h1>
  </div>
  <div id="tri"></div>
</div>

我发现了有关background-image&文本倒排，但我不知道如何使用DIV.

I found some results about background-image & inverted text, but I don't know how to do it with DIVs.

推荐答案

如果仅将相同的文本添加到tri层，则它的工作原理是:

If you just add the same text to the tri layer, it works:

编辑:为了允许选择文本，我添加了另一个透明层，该透明​​层将所有文本包装为一个单元.但是，它确实使更新更具重复性.作为解决方案，我添加了附加的JavaScript代码(不必要).

Edit: In order to allow selecting the text, I've added another transparent layer that wraps all the text as one unit. It does, however, makes updates more repetitive. As a solution, I've added the attached JavaScript code (which isn't necessary).

var text = "TEXT";
var textElements = document.getElementsByTagName("h1");
for (var i=0; i<textElements.length; i++) {
  textElements[i].innerHTML = text;
}

#warp,
#text,
#tri,
#selectable {
  position: absolute;
  top: 0;
  left: 0;
  width: 150px;
  height: 150px;
}

#warp {
  background-color: orange;
}

#text {
  text-align: center;
  z-index: 1;
}

h1 {
  margin: 0;
  line-height: 150px;
  mix-blend-mode: difference;
}

#tri {
  background-color: black;
  clip-path: polygon(0 0, 0 100%, 99.8% 150px);
  -webkit-clip-path: polygon(0 0, 0 100%, 99.8% 150px);
  z-index: 2;
  color: blue;
  text-align: center;
}

#selectable {
  text-align: center;
  z-index: 5;
  color: transparent;
}

<div id="warp">
  <div id="text">
    <h1>TEXT</h1>
  </div>
  <div id="tri">
    <h1>TEXT</h1>
  </div>
  <div id="selectable">
    <h1>TEXT</h1>
  </div>
</div>

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