新增和刪除偵聽事件：

this.initEvent = function(){ var mousewheelevt=(/Firefox/i.test(navigator.userAgent))? "DOMMouseScroll" : "mousewheel"; //FF doesn't recognize mousewheel as of FF3.x if (document.attachEvent) //if IE (and Opera depending on user setting) document.attachEvent("on"+mousewheelevt, this.resizeImages); else if (document.addEventListener) //WC3 browsers document.addEventListener(mousewheelevt, this.resizeImages, false); }; this.removeEvent = function(){ var mousewheelevt=(/Firefox/i.test(navigator.userAgent))? "DOMMouseScroll" : "mousewheel"; //FF doesn't recognize mousewheel as of FF3.x if (document.detachEvent) //if IE (and Opera depending on user setting) document.detachEvent("on"+mousewheelevt, this.resizeImages); else if (document.removeEventListener) //WC3 browsers document.removeEventListener(mousewheelevt, this.resizeImages); };

參考文件~http://www.javascriptkit.com/javatutors/onmousewheel.shtml