<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>按下鼠标 元素跟着鼠标移动（使用 CSS 变量）</title>
<style>
:root {
--mouse-x: 0;
--mouse-y: 0;
}
.title {
padding: 10px;
width: 100px;
border: 1px solid #000;
margin-top: calc(var(--mouse-y) * 1px);
margin-left: calc(var(--mouse-x) * 1px);
}
</style>
</head>
<body>
<div class="title">test</div>
</body>
<script>
const docStyle = document.documentElement.style;
const box = document.getElementsByClassName("title")[0];
box.addEventListener("mousedown", (e) => move());
box.addEventListener("mouseup", (e) => cancleMove());
function changeBoxPosition(e) {
// JavaScript 操作 CSS 变量
docStyle.setProperty("--mouse-x", e.clientX - 10);
docStyle.setProperty("--mouse-y", e.clientY - 10);
}
function move() {
document.addEventListener("mousemove", changeBoxPosition);
}
function cancleMove() {
document.removeEventListener("mousemove", changeBoxPosition);
}
</script>
</html>
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