javascript - 如何在重叠图像时更改字体颜色？

Question

前几天我看到了这个网站https://bahaasamir.me我想知道如何复制这种文字效果？我的意思是在重叠图像(CSS 或 JS)时将黑色更改为白色。我试过使用混合模式，但结果并不尽如人意。有关如何实现这种效果的任何见解或方向？

Answer 1

您有几个选择。您可以选择自己编写脚本和 css 动画，也可以使用库

animejs

另一种选择是使用 CSS 动画

.element {
  height: 250px;
  width: 250px;
  margin: 0 auto;
  background-color: red;
  animation-name: stretch;
  animation-duration: 1.5s; 
  animation-timing-function: ease-out; 
  animation-delay: 0;
  animation-direction: alternate;
  animation-iteration-count: infinite;
  animation-fill-mode: none;
  animation-play-state: running;
}

@keyframes stretch {
  0% {
    transform: scale(.3);
    background-color: red;
    border-radius: 100%;
  }
  50% {
    background-color: orange;
  }
  100% {
    transform: scale(1.5);
    background-color: yellow;
  }
}

body,
html {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

<div class="element"></div>

只需检查 CSS 文本动画

@import "compass/css3";

@import url(https://fonts.googleapis.com/css?family=Finger+Paint);

body {
  background: black;
  overflow: hidden;
  font: 5vw/100vh "Finger Paint";
  text-align: center;
  color: transparent;
  backface-visibility: hidden;
}

span {
  display: inline-block;
  text-shadow: 0 0 0 whitesmoke;
  animation: smoky 5s 3s both;
}

span:nth-child(even){
  animation-name: smoky-mirror;
}

@keyframes smoky {
  60% {
    text-shadow: 0 0 40px whitesmoke;
  }
  to {
    transform:
      translate3d(15rem,-8rem,0)
      rotate(-40deg)
      skewX(70deg)
      scale(1.5);
    text-shadow: 0 0 20px whitesmoke;
    opacity: 0;
  }
}

@keyframes smoky-mirror {
  60% {
    text-shadow: 0 0 40px whitesmoke; }
  to {
    transform:
      translate3d(18rem,-8rem,0)
      rotate(-40deg) 
      skewX(-70deg)
      scale(2);
     text-shadow: 0 0 20px whitesmoke;
    opacity: 0;
  }
}

@for $item from 1 through 21 {
  span:nth-of-type(#{$item}){ 
    animation-delay: #{(3 + ($item/10))}s; 
  }
} 

<span>C</span><span>S</span><span>S</span><span>&nbsp;</span><span>S</span><span>m</span><span>o</span><span>k</span><span>y</span><span>&nbsp;</span><span>T</span><span>e</span><span>x</span><span>t</span><span>&nbsp;</span><span>E</span><span>f</span><span>f</span><span>e</span><span>c</span><span>t</span>

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