本文分享一个使用js实现的鼠标拖动div的效果，不同于网上其他的案例，这里实现的是鼠标按在菜单上移动，整个DIV跟着移动的效果。具体细节就不分析了，演示地址，自己看下面的代码吧！
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
<script src="https://cdn.staticfile.org/jquery/3.4.1/jquery.min.js" type="text/JavaScript" charset="utf-8"></script>
<style type="text/CSS">
* {margin: 0;padding: 0;}
#pic {width: 80px;height: 80px;position: absolute;left: 0;right: 0;border:1px solid #999;width:260px;height:380px;}
a {border: 1px solid red;}
#menu{cursor:move;height:50px;background-color:#ccc;border-bottom:1px solid #999;text-align: center;padding-top: 20px;}
</style>
</head>
<body>
<div id="pic">
<div id="menu">用鼠标拖动这里可以移动！</div>
</div>
<script type="text/javascript">
var drag = function (obj, moveObj) {
obj.bind("mousedown", start);
function start(event) {
if (event.button == 0) {
gapX = event.clientX - obj.offset().left;
gapY = event.clientY - obj.offset().top;
$(document).bind("mousemove", move);
$(document).bind("mouseup", stop);
}
return false;
}
function move(event) {
moveObj.css({
"left": (event.clientX - gapX) + "px",
"top": (event.clientY - gapY) + "px"
});
return false;
}
function stop() {
$(document).unbind("mousemove", move);
$(document).unbind("mouseup", stop);
}
}
drag($("#menu"), $("#pic"));
</script>
</body>
</html>
