鼠标拖曳
<!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>Document</title>
<style>
div{
width: 200px;
height: 200px;
background-color: #f00;
position: absolute;
}
</style>
</head>
<body>
<div class="box"></div>
<script>
var oBox = document.querySelector('.box') ;
// 拖拽
// 鼠标按下
// 获取鼠标距离盒子的位置
// 鼠标移动
// 鼠标抬起
oBox.onmousedown = function(e){
var e = event || e ;
var gapx = e.x - oBox.offsetLeft ;
var gapy = e.y - oBox.offsetTop ;
document.onmousemove = function(e) {
var e = event || e ;
var x = e.x - gapx;
var y = e.y - gapy ;
oBox.style.cssText =`left:${x}px;top:${y}px`
}
}
document.onmouseup = function() {
document.onmousemove = null
}
</script>
</body>
</html>
