<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div style="width: 200px;height: 200px;background-color: blue;position: absolute;"></div>
<script>
let div = document.querySelector('div');
let flag = false
div.addEventListener('mousedown', (e) => {
flag = true
let x = e.offsetX;
let y = e.offsetY;
document.addEventListener('mousemove', (e) => {
let _h = window.innerHeight - div.offsetHeight
let _w = window.innerWidth - div.offsetWidth
let div_left = e.clientX - x;
let div_top = e.clientY - y;
div_top = Math.min(Math.max(0,div_top),_h)
div_left = Math.min(Math.max(0,div_left),_w)
if(flag){
div.style.top = div_top + 'px';
div.style.left = div_left + 'px';
}
});
});
div.addEventListener('mouseup',()=>{
flag = false
})
</script>
</body>
</html>
：JavaScript實現拖動div盒子
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