张虓敏

```html div{ width: 300px; height: 300px; background-color: skyblue; margin-top: -320px; margin-left: 1200px; position: fixed; text-align: center; } 滑动滚轮 var ofour=document.querySelector("#four"); ofour.addEventListener('mousewheel',function(e){ var zoom=parseInt(ofour.style.zoom, 10)||100; zoom+=event.wheelDelta/12; console.log(zoom); if (zoom>0) ofour.style.zoom=zoom+'%'; return...