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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Mouse Shadow</title>
</head>
<body>
<div class="hero">
<h1 contenteditable>🔥WOAH!</h1>
</div>
<style>
html {
color: black;
font-family: sans-serif;
}
body {
margin: 0;
}
.hero {
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
color: black;
}
h1 {
text-shadow: 10px 10px 0 rgba(0, 0, 0, 1);
font-size: 100px;
}
</style>
<script>
// hero是占满整个页面的
const hero = document.querySelector('.hero');
const text = hero.querySelector('h1');
const walk = 500; // 100px - 阴影最多向一侧偏移50px
function shadow(e) {
// const width=hero.offserWidth;
// const height=hero.offsetHeight;
const { offsetWidth: width, offsetHeight: height } = hero;
let { offsetX: x, offsetY: y } = e;
// 当鼠标位于.hero内h1外时显示的是相对于.hero的坐标，在页面左上角为(0,0)
// 当鼠标位于h1内部时显示的是相对于h1的坐标，在h1左上角为(0,0)
// console.log(x, y);
// 为解决此问题，当触发事件的是child时要在坐标加上到this元素零点距离
if (this !== e.target) {
x = x + e.target.offsetLeft;
y = y + e.target.offsetTop;
}
// console.log(x, y);
// 当鼠标在窗口最右阴影偏移50px，在最左时阴影偏移-50px
const xWalk = Math.round((x / width * walk) - (walk / 2));
const yWalk = Math.round((y / height * walk) - (walk / 2));
// console.log(xWalk, yWalk);
text.style.textShadow = `
${xWalk}px ${yWalk}px 0 rgba(255,0,255,0.7),
${xWalk * -1.2}px ${yWalk * -0.8}px 0 rgba(0,255,255,0.7),
${yWalk}px ${xWalk}px 0 rgba(0,255,0,0.7),
${yWalk * -0.8}px ${xWalk * -1.2}px 0 rgba(0,0,255,0.7)
`;
}
hero.addEventListener('mousemove', shadow)
</script>
</body>
</html>