完全拖出这个层，图片会消失，否则图片会回到原来的位置
<html> <head> <title></title> <style type="text/css"> #mydiv{ width:900px; background-color:#444; border:1px solid red} #mydiv2{ width:900px;; border:1px solid red} img{ width:200px; height:200px;} ul{ list-style-type:none;} ul li{ display:inline;} </style> <script src="https://www.jb51.net/js/Jquery1.7.js" type="text/javascript"></script> <!-- <script src="https://www.jb51.net/js/jquery-ui-1.8.18.custom.min.js" type="text/javascript"></script>--> <!-- 或1.8用以下四个--> <script src="https://www.jb51.net/js/jquery.ui.core.js" type="text/javascript"></script> <script src="https://www.jb51.net/js/jquery.ui.widget.js" type="text/javascript"></script> <script src="https://www.jb51.net/js/jquery.ui.mouse.js" type="text/javascript"></script> <script src="https://www.jb51.net/js/jquery.ui.draggable.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { //存储的是被拖动的图片的初始坐标 var startleft = 0; var starttop = 0; $('img').draggable({ start: function () { //为两个变量设置被拖动图片的初始坐标 startleft = $(this).offset().left; starttop = $(this).offset().top; }, stop: function () { if ($(this).offset().left > $('#mydiv').offset().left + $('#mydiv').width() || $(this).offset().top > $('#mydiv').offset().top + $('#mydiv').height()) { $(this).remove(); } else { //复位 $(this).offset({ left: startleft, top: starttop }) } } }) }) </script> </head> <body> <div> <ul> <li><img src="https://www.jb51.net/images/img01.jpg" /></li> <li><img src="https://www.jb51.net/images/img02.jpg" /></li> <li><img src="https://www.jb51.net/images/img03.jpg" /></li> <li><img src="https://www.jb51.net/images/img04.jpg" /></li> </ul> </div> </body> </html>