代码演示效果如下
3.png
该色块可以用鼠标进行移动
代码实现
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>鼠标拖拽</title>
<style>
#box {
background-color: rgb(0, 251, 255);
width: 300px;
height: 200px;
position: absolute;
}
</style>
</head>
<body>
<div id="box"></div>
<script>
let box = document.getElementById('box')
box.onmousedown = function (e) {
let ox = e.offsetX
let oy = e.offsetY
document.onmousemove = function (e2) {
let cx = e2.clientX
let cy = e2.clientY
let _left = cx - ox
let _top = cy - oy
if (_left < 0) {
_left = 0
}//左边界
if (_top < 0) {
_top = 0
}//上边界
if (_left > window.innerWidth - box.offsetWidth) {
_left = window.innerWidth - box.offsetWidth
}//右边界
if (_top > window.innerHeight - box.offsetHeight) {
_top = window.innerHeight - box.offsetHeight
}//下边界
box.style.left = _left + 'px'
box.style.top = _top + 'px'
}
}
document.onmouseup = function () {
document.onmousemove = null
}
</script>
</body>
</html>
