代码一：实现鼠标能够拖动div
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="rec" style="position:absolute;left: 100px;top: 100px; width: 50px;height: 50px;background: red;"></div>
</body>
<script type="text/javascript">
//获取div元素
var rec = document.getElementById("rec")
var down = false;
var dx = 0;
var dy = 0;
var sx = 0;
var sy = 0;
document.onmousemove = function(e){
if (down) {
var ev = e || event;
console.log(ev.clientY)
rec.style.top = ev.clientY - (dy - sy) + 'px';
rec.style.left = ev.clientX - (dx - sx) + 'px';
}
}
rec.onmousedown = function(){
dx = event.clientX;
dy = event.clientY;
sx = parseInt(rec.style.left);
sy = parseInt(rec.style.top);
if (!down) {
down = true;
}
}
document.onmouseup = function(){
if (down) {
down = false;
}
}
</script>
</html><!DOCTYPE html>
<html>
