<script src="jquery/jquery-3.3.1.min.js"></script> <script type="text/javascript"> $(function () { $("li").click(function () { $(this).toggleClass(\'red\'); }) console.log($("ul").offset().top) console.log($("ul").position().top) }) </script> </head> <body> <div style="position: absolute;top: 100px;left: 100px;"> <ul style="position: absolute;top: 10px;left: 10px;"> <li class="red">ads</li> <li>ads</li> <li>ads</li> <li>ads</li> <li>ads</li> </ul> </div>
结果：
可以看出offset()是相对于body来说的，而position是相对于父元素来说的