本文实例为大家分享了js实现鼠标拖拽事件的具体代码，供大家参考，具体内容如下
<Meta charset="UTF-8">
<style>
body{
margin: 0;
padding: 0;
}
div{
position: absolute;
top: 200px;/*div的y轴*/
left: 150px;/*div的x轴*/
width: 300px;
height: 200px;
background-color: gray;
}
div:hover{
cursor: move;
}
</style>
<script>
/*
* 分析：
* <a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>鼠标实时移动的坐标；m_move_x,m_move_y
* 鼠标按下时的坐标；m_down_x,m_down_y
* div的坐标；dx,dy
* 鼠标按下时，鼠标与div的偏移量；md_x,md_y
* div的新坐标；ndx,ndy
*/
var isDown = false;//记录鼠标状态
var move_div ;//要操作的div对象
var m_move_x,m_move_y,m_down_x,m_down_y,dx,dy,md_x,md_y,ndx,ndy;
//鼠标按下
function down(){
move_div = document.getElementById("move_div");
isDown = true;
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>鼠标按下时坐标
m_down_x = event.pageX;
m_down_y = event.pageY;
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>div坐标
dx = move_div.offsetLeft;
dy = move_div.offsetTop;
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>鼠标与div偏移量
md_x = m_down_x - dx;
md_y = m_down_y - dy;
}
//鼠标移动
function move(){
move_div = document.getElementById("move_div");
//实时更新div的坐标
dx = move_div.offsetLeft;
dy = move_div.offsetTop;
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>鼠标移动实时坐标
m_move_x = event.pageX;
m_move_y = event.pageY;
//鼠标按下时移动才触发
if(isDown){
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>新div坐标，鼠标实时坐标 - 鼠标与div的偏移量
ndx = m_move_x - md_x;
ndy = m_move_y - md_y;
//把新div坐标值赋给div对象
move_div.style.left = ndx+"px";
move_div.style.top = ndy+"px";
}
}
//鼠标释放
function up(){
isDown = false;
}
</script><div id="move_div" onmousedown="down()" onmouseup="up()" onmousemove="move()"></div>