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javascript滾輪控制類比捲軸，javascript滾輪
此執行個體通過對滾輪事件的監聽，通過滾輪控制捲軸的上下移動，可以將其修改後運用與使用滾輪縮放圖片、改變透明度等特效。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> *{ margin: 0; padding: 0; } #boxwrap{ position: relative; width: 15px; height: 500px; margin: 50px auto; box-sizing: border-box; border: 1px solid gainsboro; border-radius: 6px; } #box{ position: absolute; left: 0px; top: 0px; width: 13px; height: 30px; background: gray; border-radius: 6px; } </style> <script type="text/javascript"> window.onload = function (){ var boxwrp = document.getElementById('boxwrap'); var box = document.getElementById('box'); //相容firefox if(boxwrp.addEventListener){ document.addEventListener("DOMMouseScroll", fn, false); } document.onmousewheel = fn;//相容IE、chrome function fn(ev){ var ev = ev||event; var bool = false; //IE、chrome 向上：120，向下：-120 if(ev.wheelDelta){ bool= ev.wheelDelta > 0? true : false; } //firefox 向上：-3，向下：3 else{ bool= ev.detail < 0? true : false; } if(bool){ if(box.offsetTop>=10){ box.style.top = box.offsetTop - 10 + "px"; } else{ box.style.top = 0; } } else{ if(box.offsetTop<=boxwrp.offsetHeight-box.offsetHeight-10){ box.style.top = box.offsetTop + 10 + "px"; } else{ box.style.top = boxwrp.offsetHeight - box.offsetHeight + "px"; } } } } </script> </head> <body> <div id="boxwrap"> <div id="box"></div> </div> </body> </html>
以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援幫客之家。
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