请教各给前辈，跪谢<!DOCTYPE html><html><head> <title>title</title> <style> div { overflow-y: auto; height: 100px; width: 400px; border: 1px dotted red; } li { list-style: none; width: 200px; height: 100px; border: 1px solid black; } </style></head><body><div id="box"> <ul> <li>1</li> <li>2</li> <li>3</li> </ul></div><script type="text/javascript"> var oBox = document.getElementById("box") oBox.onmousewheel=function(e){ console.log(oBox.children[0].scrollTop) }</script></body></html>我在oBox上加mousewheel事件,取出来的scrollTop一直都为0 这是为啥呢
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