當背景顏色為黑色時，使用 mix-blend-mode: Difference 將文字顏色變更為白色效果很好。將滑鼠移至文字處即可查看效果：
const blackBox = document.querySelector(".black-box");
window.addEventLis tener('mousemove', function(event) {
blackBox.style.left = `${event.pageX - 50}px`;
blackBox.style.top = `${event.pageY - 50}px`;
});
.wrapper {
background-color: white;
}
h1 {
position: relative;
z-index: 2;
color: white;
mix-blend-mode: difference;
}
.black-box {
width: 100px;
height: 100px;
position: absolute;
z-index: 1;
background-color: black;
}
<div class="wrapper"> <h1>Lorem Ipsum</h1> </div> <div class="black-box"></div>
如果背景不是黑色，這不會產生白色文本，這是可以理解的：
const box = document.querySelector(".box");
window.addEventList ener('mousemove', function(event) {
box.style.left = `${event.pageX - 50}px`;
box.style.top = `${event.pageY - 50}px`;
});
.wrapper {
background-color: white;
}
h1 {
position: relative;
z-index: 2;
color: white;
mix-blend-mode: difference;
}
.box {
width: 100px;
height: 100px;
position: absolute;
z-index: 1;
background-image: url("https://placekitten.com/100/100")
}
<div class="wrapper"> <h1>Lorem Ipsum</h1> </div> <div class="box"></div>
有什麼方法可以讓背景與白色不同時文字顏色從黑色變成白色嗎？
這是一個依賴背景顏色而不是
混合混合模式的想法。訣竅是使用與影像相同尺寸的漸變，以相同的方式移動以模擬混合模式：const box = document.querySelector(".box"); const h1 = document.querySelector("h1"); window.addEventListener('mousemove', function(event) { box.style.left = `${event.pageX - 50}px`; box.style.top = `${event.pageY - 50}px`; h1.style.backgroundPosition = `${event.pageX - 50}px ${event.pageY - 50}px`; });.wrapper { background-color: white; } h1 { position: relative; z-index: 2; color: white; background: /*gradient position / size */ linear-gradient(#fff,#fff) -100px -100px/100px 100px fixed no-repeat, #000; -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; } .box { width: 100px; height: 100px; position: absolute; z-index: 1; background-image: url("https://placekitten.com/100/100") }