JS 小球坠落效果

来源：互联网发布：淘宝美工在线培训编辑：程序博客网时间：2024/06/10 13:26

<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><title>html5动画</title><link rel="stylesheet" type="text/css" href="main.css"><script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script><script type="text/javascript" src="tween.js"></script><script type="text/javascript" src="requestAnimationFrame.js"></script></head><body>    <ball></ball><shadow></shadow></body></html><script type="text/javascript">    var ball = $("ball"), shadow = $("shadow");var objBall = {};var shadowWithBall = function(top) {    // 0 ~ 500    var top = top || parseInt(ball.css("top")),    scale = 1 + (500 - top) / 300;    opacity = 1 - (500 - top) / 300;    if (opacity < 0) opacity = 0;    shadow.css("opacity", opacity)    .css("WebkitTransform", "scale("+ [scale, scale].join(",") +")")    .css("transform", "scale("+ [scale, scale].join(",") +")");}, funFall = function() {    var start = 0, during = 100;    var _run = function() {        start++;        var top = Tween.Bounce.easeOut(start, objBall.top, 500 - objBall.top, during);        ball.css("top", top);        shadowWithBall(top);        if (start < during) requestAnimationFrame(_run);    };    _run();};ball.bind("mousedown", function(event) {    objBall.pageY = event.pageY;    objBall.flagFollow = true;  });$(document).bind("mousemove", function(event) {    if (objBall.flagFollow) {        var pageY = event.pageY;        objBall.top = 500 - (objBall.pageY - pageY);        if (objBall.top < 0) {            objBall.top = 0;        } else if (objBall.top > 500) {            objBall.top = 500;        }        //cosnole.log(objBall.top);        ball.css("top", objBall.top);        shadowWithBall(objBall.top);        }});$(document).bind("mouseup", function(event) {    if (objBall.flagFollow) funFall();    objBall.flagFollow = false; });</script>

CSS

ball{    width: 100px;    height: 100px;    border-radius: 100px;    position: absolute;    left: 50%;    top: 500px;    margin-left: -50px;    background-color: #34538b;    background-image: -webkit-radial-gradient(100px 100px at 50px 20px, #a0b3d6, #34538b);    background-image: -moz-radial-gradient(100px 100px at 50px 20px, #a0b3d6, #34538b);    background-image: radial-gradient(100px 100px at 50px 20px, #a0b3d6, #34538b);    cursor: move;    z-index: 1;}shadow {    position: absolute;    width: 100px;    height: 30px;    position: absolute;    left: 50%;    bottom: 5px;    margin-left: -50px;    background-image: -webkit-radial-gradient(ellipse closest-side, rgba(0,0,0,.75), rgba(0,0,0,0));    background-image: -moz-radial-gradient(ellipse closest-side, rgba(0,0,0,.75), rgba(0,0,0,0));    background-image: radial-gradient(ellipse closest-side, rgba(0,0,0,.75), rgba(0,0,0,0));}

requestAnimationFrame.js

(function() {    var lastTime = 0;    var vendors = ['webkit', 'moz'];    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {        window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];        window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||    // name has changed in Webkit                                      window[vendors[x] + 'CancelRequestAnimationFrame'];    }    if (!window.requestAnimationFrame) {        window.requestAnimationFrame = function(callback, element) {            var currTime = new Date().getTime();            var timeToCall = Math.max(0, 16.7 - (currTime - lastTime));            var id = window.setTimeout(function() {                callback(currTime + timeToCall);            }, timeToCall);            lastTime = currTime + timeToCall;            return id;        };    }    if (!window.cancelAnimationFrame) {        window.cancelAnimationFrame = function(id) {            clearTimeout(id);        };    }}());

Tween.hs

/* * Tween.js * t: current time（当前时间）； * b: beginning value（初始值）； * c: change in value（变化量）； * d: duration（持续时间）。 * you can visit 'http://easings.net/zh-cn' to get effect*/var 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) {            var s;            if (t==0) return b;            if ((t /= d) == 1) return b + c;            if (typeof p == "undefined") p = d * .3;            if (!a || a < Math.abs(c)) {                s = p / 4;                a = c;            } else {                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) {            var s;            if (t==0) return b;            if ((t /= d) == 1) return b + c;            if (typeof p == "undefined") p = d * .3;            if (!a || a < Math.abs(c)) {                a = c;                 s = p / 4;            } else {                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) {            var s;            if (t==0) return b;            if ((t /= d / 2) == 2) return b+c;            if (typeof p == "undefined") p = d * (.3 * 1.5);            if (!a || a < Math.abs(c)) {                a = c;                 s = p / 4;            } else {                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 (typeof s == "undefined") s = 1.70158;            return c * (t /= d) * t * ((s + 1) * t - s) + b;        },        easeOut: function(t, b, c, d, s) {            if (typeof 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 (typeof 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;            }        }    }}Math.tween = Tween;

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