根据背景色反转CSS字体颜色

wz1wpwve  于 2023-02-17  发布在  其他
关注(0)|答案(4)|浏览(169)

是否有一个CSS属性可以根据background-color反转font-color,如下图所示?

rdlzhqv9

rdlzhqv91#

有一个CSS属性叫做mix-blend-mode,但是IE不支持,我推荐使用pseudo elements,如果你想支持IE6和IE7,你也可以使用two DIVs代替伪元素。

.inverted-bar {
    position: relative;
}

.inverted-bar:before,
.inverted-bar:after {
    padding: 10px 0;
    text-indent: 10px;
    position: absolute;
    white-space: nowrap;
    overflow: hidden;
    content: attr(data-content);
}

.inverted-bar:before {
    background-color: aqua;
    color: red;
    width: 100%;
}

.inverted-bar:after {
    background-color: red;
    color: aqua;
    width: 20%;
}
<div class="inverted-bar" data-content="Lorem ipsum dolor sit amet"></div>
fquxozlt

fquxozlt2#

使用mix-blend-mode

http://jsfiddle.net/1uubdtz6/

div {
    position:absolute;
    height:200px
}

/* A white bottom layer */
#whitebg { 
    background: white; 
    width:400px; 
    z-index:1
}

/* A black layer on top of the white bottom layer */
#blackbg { 
    background: black; 
    width:100px; 
    z-index:2
}

/* Some white text on top with blend-mode set to 'difference' */
span {
    position:absolute; 
    font-family: Arial, Helvetica; 
    font-size: 100px; 
    mix-blend-mode: difference;
    color: white;
    z-index: 3
}

/* A red DIV over the scene with the blend-mode set to 'screen' */
#makered { 
    background-color: red;
    mix-blend-mode: screen;
    width:400px; 
    z-index:4
}
<div id="whitebg"></div>
<div id="blackbg"></div>
<div id="makered"></div>

<span>test</span>
u4dcyp6a

u4dcyp6a3#

我知道这是一个老问题,但我想添加另一个在了解mix-blend-mode之前一直使用的解决方案。
我们的想法是将信息复制到两个图层中,一个是 * back *,另一个是 * front *,其中 * back * 和 * front * 的背景和文本颜色不同。它们在尺寸和文本上是相同的。在这两个图层之间,我使用一个剪切框div来剪切 * front *。(顶部)层调整到所需宽度,显示未剪切的 * 前 * 层,并在剪切窗口外显示 * 后 * 层。
这类似于可接受答案中的"两格"解决方案,但使用了额外的剪切框。此解决方案的优点是,如果需要,可以轻松地将文本居中,并且可以简单、直接地选择颜色。
超文本:

<div class='progress' id='back'>
  <span></span>
  <div class='progress' id='boundbox'>
    <div class='progress' id='front'>
    </div>
  </div>
</div>

CSS:

.progress {
  display: block;
  margin: 0;

  /* Choose desired padding/height in coordination with font size */
  padding: 10px;
  height: 28px;
}

#back {
  position: relative;

  /* Choose a border to your liking, or none */
  border: 1px solid lightgray;

  /* Choose your desired text attributes */
  text-align: center;
  font-family: Calibri, "Sans Serif";
  font-size: 16pt;

  /* Set the desired width of the whole progress bar */
  width: 75%;

  /* Choose the desired background and text color */
  background-color: white;
  color: black;
}

#front {
  position: absolute;
  left: 0;
  top: 0;

  /* Choose the desired background and text colors */
  background-color: navy;
  color: white;
}

#boundbox {
  position: absolute;
  left: 0;
  top: 0;
  overflow: hidden;
}

我使用jQuery以编程方式设置进度百分比,并确保 * front * 的宽度与 * back * 的宽度匹配,并且它们具有相同的文本,这也可以用纯Javascript轻松完成。

// Set *front* width to *back* width
// Do this after DOM is ready
$('#front').width($('#back').width())

// Based upon an event that determines a content change
// you can set the text as in the below example
percent_complete = 45  // obtain this value from somewhere; 45 is just a test

$('#front').text(percent_complete.toString() + '% complete')
$('#back span').text($('#front').text())
bb_width = (percent_complete * $('#back').width())/100
$('#boundbox').css('width', bb_width.toString())

这里有一把小提琴:Progress bar.

我在Chrome、Firefox、Microsoft Edge和IE版本11中进行了测试。

68de4m5k

68de4m5k4#

我觉得这样比较容易理解。

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
.titulo{
    text-align: center;
    margin: 2em;
}
.padre{
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10em;
    position: relative;
    width: 1000px;
    height: 500px;
}
.caja-1{
    background-color: black;
    width: 500px;
    height: 500px;
    left: 0;
    mix-blend-mode: screen;
    position:absolute;
}
.caja-3{
    width: 500px;
    height: 500px;
    display: flex;
    background-color: white;
    position: absolute;
    right: 0;
}
.texto{
    font-size: 5em;
    color: white;
    mix-blend-mode: difference;
    position:absolute;
}
<!DOCTYPE html>
<html lang="es">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>ESTILOS CONTRASTADOS CSS3</title>
</head>
<body>
    <h1 class="titulo">MIX-BLEND-MODE CSS EFFECT</h1>
    <div class="padre">
        <div class="caja-1"></div>
        <div class="caja-3"></div>
        <h1 class="texto">CODE STOCK CENTER</h1>
    </div>
</body>
</html>

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