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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>autofit-scale</title>
<style>
html, body, div {
padding: 0;
margin: 0;
}
body {
overflow: hidden;
}
.container {
background-color: black;
color: white;
width: 1920px;
height: 1080px;
position: relative;
}
.right-b {
position: absolute;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div class="container">
这里是大屏
<div class="right-b">这里是大屏</div>
</div>
<script>
autofitScale('.container', { width: 1920, height: 1080 })
function autofitScale(selector, options) {
const el = document.querySelector(selector)
const { width, height } = options
el.style.transformOrigin = 'left top'
el.style.transition = 'transform 0.3s'
function init() {
const scaleX = window.innerWidth / width
const scaleY = window.innerHeight / height
const scale = Math.min(scaleX, scaleY)
const left = (window.innerWidth - width * scale) / 2
const top = (window.innerHeight - height * scale) / 2
el.style.transform = `translate(${left}px, ${top}px) scale(${scale})`
}
init()
window.addEventListener('resize', debounce(init, 300))
}
function debounce(fn, delay) {
let timer
return function(...args) {
if (timer) clearTimeout(timer)
timer = setTimeout(() => {
fn.apply(this, args)
}, delay)
}
} }
}
</script>
</body>
</html>
|