本文主要向大家介绍了Flash基础入门之关于flash的mousewheel事件，通过具体的内容向大家展现，希望对大家学习Flash基础入门有所帮助。

flash在wmode为opaque或transparent时，AS编写的鼠标滚轮事件失效。在此情况下，只能通过外部的JS实现事件绑定。我的实现代码如下：（已通过firefox,chrome,IE8测试）

function registMousewheel(id){

                function _onmousewheel(e) {

                    var target = e.srcElement || e.target;

                    if(mousewheelHandler.containsTarget(target)){

                        var delta = 0;

                        if(e.wheelDelta ){

                            delta = e.wheelDelta / 120;                        

                        }else if(e.detail){

                            delta = -e.detail;

                        }

                        if (delta != 0) {                            

                            target.mousewheelHandler && target.mousewheelHandler(delta);

                        }

                        e.preventDefault && e.preventDefault();

                    }

                    return false;

                }

                if (typeof mousewheelHandler == "undefined") {

                    var _mousewheelHandler = {

                        targets:{},

                        containsTarget:function(target){

                            return target.id in this.targets;

                        },

                        regist:function(el) {

                            if(typeof el=="string"){

                                el = document.getElementById(el);

                            }

                            if (el == null) return;

                            this.targets[el.id] = el;

                            if(typeof window.attachEvent!="undefined"){                                

                                document.attachEvent("onmousewheel",_onmousewheel);

                            }else if(typeof window.addEventListener!="undefined"){                                

                                document.addEventListener("DOMMouseScroll",_onmousewheel,false);

                                document.addEventListener("mousewheel",_onmousewheel,false);

                            }

                        },

                        unregistAll:function(){

                            if(typeof window.attachEvent!="undefined"){                        

                                document.detachEvent("onmousewheel",_onmousewheel);

                            }else if(typeof window.addEventListener!="undefined"){                        

                                document.removeEventListener("DOMMouseScroll",_onmousewheel,false);

                                document.removeEventListener("mousewheel",_onmousewheel,false);

                            }

                            this.targets = {};

                        }

                    };

                    mousewheelHandler = _mousewheelHandler;

                }

                mousewheelHandler.regist(id);

            }

可以将上面的JS代码写在AS脚本中，当flash加载完成时直接调用。

值得注意的是，DOMMouseScroll只适用于firefox且只能绑定在document上。

最后，比较容易犯错的一点，flash提供的回调函数名称一定不要与事件名称相同，如onmousewheel,onclick等，这样在IE下会提示找不到方法的错误，切记！

本文由职坐标整理并发布，希望对同学们有所帮助。了解更多详情请关注职坐标常用软件Flash频道！