【animate】js动画(animate)简单引擎代码示例

$util={
   
    type : function(obj){
        var rep=/\[object\s+(\w+)\]/i;
        var str=Object.prototype.toString.call(obj).toLowerCase();
        str.match(rep);
        return RegExp.$1;
    },
   
    $unlink :function (object){
        var unlinked;
        switch ($type(object)){
            case 'object':
                unlinked={};
                for (var p in object) {
                    unlinked[p]=$unlink(object[p]);
                }
            break;
            case 'array':
                unlinked=[];
                for (var i=0, l=object.length; i < l; i++) {
                    unlinked[i]=$unlink(object[i]);
                }
            break;
            default: return object;
        }
        return unlinked;
    },
   
    dom:{
        $: function(id) {
            return document.getElementById(id);
        },
        getStyle: function(obj, prop) {
            var style=obj.currentStyle || window.getComputedStyle(obj, '');
            if (obj.style.filter) {
                return obj.style.filter.match(/\d+/g)[0];
            }
            return style[prop];
        },
        setStyle: function(obj, prop, val) {
            switch (prop) {
            case 'opacity':
                if($util.client.browser.ie){
                    obj.style.filter='alpha(' + prop + '=' + val*100 + ')'   
                }else{
                    obj.style[prop]=val;
                }
                break;
            default:
                obj.style[prop]=val + 'px';
                break;
            }
        },
        setStyles: function(obj, props) {
            for (var prop in props) {
                switch (prop) {
                case 'opacity':
                    if($util.client.browser.ie){
                        obj.style.filter='alpha(' + prop + '=' + props[prop] + ')'       
                    }else{
                        obj.style[prop]=props[prop];
                    }
                    break;
                default:
                    obj.style[prop]=props[prop] + 'px';
                    break;
                }
            }
        }
    },
   
    evt : {
        addEvent : function(oTarget, sEventType, fnHandler) {
            if (oTarget.addEventListener) {
                oTarget.addEventListener(sEventType, fnHandler, false);
            } else if (oTarget.attachEvent) {
                oTarget.attachEvent("on" + sEventType, fnHandler);
            } else {
                oTarget["on" + sEventType]=fnHandler;
            }
        },
        rmEvent : function removeEventHandler (oTarget, sEventType, fnHandler) {
            if (oTarget.removeEventListener) {
                oTarget.removeEventListener(sEventType, fnHandler, false);
            } else if (oTarget.detachEvent) {
                oTarget.detachEvent("on" + sEventType, fnHandler);
            } else {
                oTarget["on" + sEventType]=null;
            }
        }
    },
   
    ajax : {
        request:function (options) {
                var xhr, res;
                var url=options.url,
                    context=options.context,
                    success=options.success,
                    type=options.type,
                    datatype=options.datatype,
                    async=options.async,
                    send=options.send,
                    headers=options.headers;

                try {
                    xhr=new XMLHttpRequest();
                } catch(e) {
                    try {
                        xhr=new ActiveXObject('MSXML2.XMLHTTP');
                    } catch(e) {
                        xhr=new ActiveXObject('Microsoft.XMLHTTP');
                    }
                }

                xhr.onreadystatechange=function() {
                    if (xhr.readyState==4 && xhr.status==200) {
                        res=xhr.responseText;
                        success(res);
                    }
                }
                xhr.open(type, url, async);
                xhr.send(send);
        }
    },
   
    array : {
        minIndex : function(ary){
            return Math.min.apply(null,ary);   
        },
        maxitem : function(ary){
            return Math.max.apply(null,ary);
        }
    },
   
    client : function(){
        // 浏览器渲染引擎 engines
        var engine={           
            ie: 0,
            gecko: 0,
            webkit: 0,
            khtml: 0,
            opera: 0,

            //complete version
            ver: null 
        };

        // 浏览器
        var browser={
            //browsers
            ie: 0,
            firefox: 0,
            safari: 0,
            konq: 0,
            opera: 0,
            chrome: 0,
            //specific version
            ver: null
        };

        // 客户端平台platform/device/OS
        var system={
            win: false,
            mac: false,
            x11: false,

            //移动设备
            iphone: false,
            ipod: false,
            ipad: false,
            ios: false,
            android: false,
            nokiaN: false,
            winMobile: false,

            //game systems
            wii: false,
            ps: false
        };   

        // 检测浏览器引擎
        var ua=navigator.userAgent;   
        if (window.opera){
            engine.ver=browser.ver=window.opera.version();
            engine.opera=browser.opera=parseFloat(engine.ver);
        } else if (/AppleWebKit\/(\S+)/.test(ua)){
            engine.ver=RegExp["$1"];
            engine.webkit=parseFloat(engine.ver);

            //figure out if it's Chrome or Safari
            if (/Chrome\/(\S+)/.test(ua)){
                browser.ver=RegExp["$1"];
                browser.chrome=parseFloat(browser.ver);
            } else if (/Version\/(\S+)/.test(ua)){
                browser.ver=RegExp["$1"];
                browser.safari=parseFloat(browser.ver);
            } else {
                //approximate version
                var safariVersion=1;
                if (engine.webkit < 100){
                    safariVersion=1;
                } else if (engine.webkit < 312){
                    safariVersion=1.2;
                } else if (engine.webkit < 412){
                    safariVersion=1.3;
                } else {
                    safariVersion=2;
                }  

                browser.safari=browser.ver=safariVersion;       
            }
        } else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)){
            engine.ver=browser.ver=RegExp["$1"];
            engine.khtml=browser.konq=parseFloat(engine.ver);
        } else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)){   
            engine.ver=RegExp["$1"];
            engine.gecko=parseFloat(engine.ver);

            //determine if it's Firefox
            if (/Firefox\/(\S+)/.test(ua)){
                browser.ver=RegExp["$1"];
                browser.firefox=parseFloat(browser.ver);
            }
        } else if (/MSIE ([^;]+)/.test(ua)){   
            engine.ver=browser.ver=RegExp["$1"];
            engine.ie=browser.ie=parseFloat(engine.ver);
        }

        //detect browsers
        browser.ie=engine.ie;
        browser.opera=engine.opera;
       

        //detect platform
        var p=navigator.platform;
        system.win=p.indexOf("Win")==0;
        system.mac=p.indexOf("Mac")==0;
        system.x11=(p=="X11") || (p.indexOf("Linux")==0);

        //detect windows operating systems
        if (system.win){
            if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)){
                if (RegExp["$1"]=="NT"){
                    switch(RegExp["$2"]){
                        case "5.0":
                            system.win="2000";
                            break;
                        case "5.1":
                            system.win="XP";
                            break;
                        case "6.0":
                            system.win="Vista";
                            break;
                        case "6.1":
                            system.win="7";
                            break;
                        default:
                            system.win="NT";
                            break;               
                    }                           
                } else if (RegExp["$1"]=="9x"){
                    system.win="ME";
                } else {
                    system.win=RegExp["$1"];
                }
            }
        }

        //mobile devices
        system.iphone=ua.indexOf("iPhone") > -1;
        system.ipod=ua.indexOf("iPod") > -1;
        system.ipad=ua.indexOf("iPad") > -1;
        system.nokiaN=ua.indexOf("NokiaN") > -1;

        //windows mobile
        if (system.win=="CE"){
            system.winMobile=system.win;
        } else if (system.win=="Ph"){
            if(/Windows Phone OS (\d+.\d+)/.test(ua)){;
                system.win="Phone";
                system.winMobile=parseFloat(RegExp["$1"]);
            }
        }

        //determine iOS version
        if (system.mac && ua.indexOf("Mobile") > -1){
            if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)){
                system.ios=parseFloat(RegExp.$1.replace("_", "."));
            } else {
                system.ios=2;  //can't really detect - so guess
            }
        }

        //determine Android version
        if (/Android (\d+\.\d+)/.test(ua)){
            system.android=parseFloat(RegExp.$1);
        }

        //gaming systems
        system.wii=ua.indexOf("Wii") > -1;
        system.ps=/playstation/i.test(ua);

        //return it
        return {
            engine:     engine,
            browser:    browser,
            system:     system       
        };

    }(),
   
    tween: {
        Linear: function(t, b, c, d) {
            return c * t / d + b;
        },
        Quad: {
            easeIn: function(t, b, c, d) {
                return c * (t /=d) * t + b;
            },
            easeOut: function(t, b, c, d) {
                return - c * (t /=d) * (t - 2) + b;
            },
            easeInOut: function(t, b, c, d) {
                if ((t /=d / 2) < 1) return c / 2 * t * t + b;
                return - c / 2 * ((--t) * (t - 2) - 1) + b;
            }
        },
        Cubic: {
            easeIn: function(t, b, c, d) {
                return c * (t /=d) * t * t + b;
            },
            easeOut: function(t, b, c, d) {
                return c * ((t=t / d - 1) * t * t + 1) + b;
            },
            easeInOut: function(t, b, c, d) {
                if ((t /=d / 2) < 1) return c / 2 * t * t * t + b;
                return c / 2 * ((t -=2) * t * t + 2) + b;
            }
        },
        Quart: {
            easeIn: function(t, b, c, d) {
                return c * (t /=d) * t * t * t + b;
            },
            easeOut: function(t, b, c, d) {
                return - c * ((t=t / d - 1) * t * t * t - 1) + b;
            },
            easeInOut: function(t, b, c, d) {
                if ((t /=d / 2) < 1) return c / 2 * t * t * t * t + b;
                return - c / 2 * ((t -=2) * t * t * t - 2) + b;
            }
        },
        Quint: {
            easeIn: function(t, b, c, d) {
                return c * (t /=d) * t * t * t * t + b;
            },
            easeOut: function(t, b, c, d) {
                return c * ((t=t / d - 1) * t * t * t * t + 1) + b;
            },
            easeInOut: function(t, b, c, d) {
                if ((t /=d / 2) < 1) return c / 2 * t * t * t * t * t + b;
                return c / 2 * ((t -=2) * t * t * t * t + 2) + b;
            }
        },
        Sine: {
            easeIn: function(t, b, c, d) {
                return - c * Math.cos(t / d * (Math.PI / 2)) + c + b;
            },
            easeOut: function(t, b, c, d) {
                return c * Math.sin(t / d * (Math.PI / 2)) + b;
            },
            easeInOut: function(t, b, c, d) {
                return - c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
            }
        },
        Expo: {
            easeIn: function(t, b, c, d) {
                return (t==0) ? b: c * Math.pow(2, 10 * (t / d - 1)) + b;
            },
            easeOut: function(t, b, c, d) {
                return (t==d) ? b + c: c * ( - Math.pow(2, -10 * t / d) + 1) + b;
            },
            easeInOut: function(t, b, c, d) {
                if (t==0) return b;
                if (t==d) return b + c;
                if ((t /=d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
                return c / 2 * ( - Math.pow(2, -10 * --t) + 2) + b;
            }
        },
        Circ: {
            easeIn: function(t, b, c, d) {
                return - c * (Math.sqrt(1 - (t /=d) * t) - 1) + b;
            },
            easeOut: function(t, b, c, d) {
                return c * Math.sqrt(1 - (t=t / d - 1) * t) + b;
            },
            easeInOut: function(t, b, c, d) {
                if ((t /=d / 2) < 1) return - c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
                return c / 2 * (Math.sqrt(1 - (t -=2) * t) + 1) + b;
            }
        },
        Elastic: {
            easeIn: function(t, b, c, d, a, p) {
                if (t==0) return b;
                if ((t /=d)==1) return b + c;
                if (!p) p=d * .3;
                if (!a || a < Math.abs(c)) {
                    a=c;
                    var s=p / 4;
                } else var s=p / (2 * Math.PI) * Math.asin(c / a);
                return - (a * Math.pow(2, 10 * (t -=1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
            },
            easeOut: function(t, b, c, d, a, p) {
                if (t==0) return b;
                if ((t /=d)==1) return b + c;
                if (!p) p=d * .3;
                if (!a || a < Math.abs(c)) {
                    a=c;
                    var s=p / 4;
                } else var s=p / (2 * Math.PI) * Math.asin(c / a);
                return (a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b);
            },
            easeInOut: function(t, b, c, d, a, p) {
                if (t==0) return b;
                if ((t /=d / 2)==2) return b + c;
                if (!p) p=d * (.3 * 1.5);
                if (!a || a < Math.abs(c)) {
                    a=c;
                    var s=p / 4;
                } else var s=p / (2 * Math.PI) * Math.asin(c / a);
                if (t < 1) return - .5 * (a * Math.pow(2, 10 * (t -=1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
                return a * Math.pow(2, -10 * (t -=1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
            }
        },
        Back: {
            easeIn: function(t, b, c, d, s) {
                if (s==undefined) s=1.70158;
                return c * (t /=d) * t * ((s + 1) * t - s) + b;
            },
            easeOut: function(t, b, c, d, s) {
                if (s==undefined) s=1.70158;
                return c * ((t=t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
            },
            easeInOut: function(t, b, c, d, s) {
                if (s==undefined) s=1.70158;
                if ((t /=d / 2) < 1) return c / 2 * (t * t * (((s *=(1.525)) + 1) * t - s)) + b;
                return c / 2 * ((t -=2) * t * (((s *=(1.525)) + 1) * t + s) + 2) + b;
            }
        },
        Bounce: {
            easeIn: function(t, b, c, d) {
                return c - Tween.Bounce.easeOut(d - t, 0, c, d) + b;
            },
            easeOut: function(t, b, c, d) {
                if ((t /=d) < (1 / 2.75)) {
                    return c * (7.5625 * t * t) + b;
                } else if (t < (2 / 2.75)) {
                    return c * (7.5625 * (t -=(1.5 / 2.75)) * t + .75) + b;
                } else if (t < (2.5 / 2.75)) {
                    return c * (7.5625 * (t -=(2.25 / 2.75)) * t + .9375) + b;
                } else {
                    return c * (7.5625 * (t -=(2.625 / 2.75)) * t + .984375) + b;
                }
            },
            easeInOut: function(t, b, c, d) {
                if (t < d / 2) return Tween.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
                else return Tween.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
            }
        }
    }

}

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