<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>鼠标拖动改变盒子的大小</title>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
width: 100%;
height: 100%;
background: #426ab3;
}
.box {
width: 100%;
height: 400px;
background: #9b95c9;
position: absolute;
bottom: 0;
left: 0;
}
.box-line {
width: 100%;
height: 2px;
background-color: red;
cursor: n-resize;
}
</style>
</head>
<body>
<div class="box" id="box">
<div class="box-line" id="box-line"></div>
</div>
<script>
let boxLine = document.getElementById('box-line');
let box = document.getElementById('box');
let minHeight = 400;
let maxHeight = 800;
let height = minHeight;
boxLine.onmousedown = function (event) {
const hanldeMouseUp = () => {
document.removeEventListener('mouseup', hanldeMouseUp);
document.removeEventListener('mousemove', hanldeMouseMove);
};
const hanldeMouseMove = (event) => {
const documentH = document.documentElement.clientHeight;
const nowH = documentH - event.clientY;
if (nowH >= maxHeight) {
height = maxHeight;
} else if (nowH <= minHeight) {
height = minHeight;
} else {
height = nowH;
}
box.style.height = height + 'px';
};
document.addEventListener('mouseup', hanldeMouseUp);
document.addEventListener('mousemove', hanldeMouseMove);
};
</script>
</body>
</html>
鼠标拖动改变盒子的大小
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