<html><body><p>请在下面的列表中选择一个 position 值来更改 div 的位置。</p><div id="myDiv" style="top:50px;left:100px;">我是 div 元素。</div><select onchange="myFunction(this);" size="5"> <option>absolute <option>fixed <option>static <option>relative <option>sticky</select><script>function myFunction(x) { var whichSelected = x.selectedIndex; var posVal = x.options[whichSelected].text; var elem = document.getElementById("myDiv"); elem.style.position = posVal;}</script></body></html>