如题,代码中三元运算符改写成if else则可以,为甚么?<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>用鼠标滚轮滚动控制图片的缩小放大</title><script language="javascript">function bbimg(o){ var zoom=parseInt(o.style.zoom, 10)||100; zoom+=event.wheelDelta/12; zoom < 50 ? 50 : (zoom > 200 ? 200 : zoom); //目标 console.log(zoom); o.style.zoom=zoom+'%'; return false;}</script></head><body><p>将鼠标放在图片上,点击一下,然后滚动鼠标滚轮试试看</p><p><img border="0" src="/images/pulpit.jpg" onmousewheel="return bbimg(this)"></p></body></html>
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