公司要求写一个积分抽奖系统，自行百度后，写了下面这个抽奖系统，改善了可以设置中奖概率。
素材和源码下面都写了
下面是使用js手段来写的抽检逻辑，在安全方面思考，脚本是完全公开的，虽然可以使用相关的加密手段来加密，但是这个通过js来确认谁中奖的方法，极为危险，很容易受到攻击。所以明智的方法，使用php，或者其他后台语言来写抽奖逻辑，直接根据概率生成谁中奖，然后前端界面就是播放抽奖动画就行，这样能直接有效避免脚本攻击。
js源码加密可使用的平台：JShaman
http://www.jshaman.com/protect.html
效果图：
源码：
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<div class="bg" id="content">
<div class="turntable" id="turntable"></div>
<img src="images/pointer.png" class="pointer" id="pointer"> </div>
</div>
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="js/jQueryRotate.2.2.js"></script>
<style type="text/css">
/*转盘背景*/
#content {
width: 450px;
height: 450px;
background: url(images/disc-bg.gif) no-repeat;
margin: auto;
overflow: hidden;
position: relative;
}
/*转盘*/
#turntable {
width: 352px;
height: 352px;
background: url(images/disc-rotate.gif) no-repeat;
margin: 48px 0px 0 48px;
/*transition: all 3s ease;*/
/*3秒变换一次*/
}
/*转盘指针*/
#content img {
position: absolute;
top: 90px;
left: 153px;
cursor: pointer;
}
</style>
</body>
<script type="text/javascript">
$(function(){
var bRotate=false;
$("#pointer").click(function(){
if(bRotate) return false;
var item=rnd(0,100); //生成0~10的随机数
console.log(item);
var lottery_rate = [20,21,30,40,60,70,100];
switch(true){
case item<lottery_rate[0]:
rotateFn(330,'360经验值');
break;
case item<lottery_rate[1]:
rotateFn(26, '100G永久免费空间');
break;
case item<lottery_rate[2]:
rotateFn(88, '36Mb空间');
break;
case item<lottery_rate[3]:
rotateFn(137, '100经验值');
break;
case item<lottery_rate[4]:
rotateFn(185, '360Mb空间');
break;
case item<lottery_rate[5]:
rotateFn(235, '36经验值');
break;
case item<lottery_rate[6]:
rotateFn(287, '100Mb空间');
break;
// case 7:
// rotateFn(330, '360经验值');
// break;
// case 8: //增加"未中奖"概率
// rotateFn(26, '100G永久免费空间');
// break;
// case 9:
// rotateFn(26, '100G永久免费空间');
// break;
// case 10:
// rotateFn(26, '100G永久免费空间');
// break;
}
})
function rnd(n,m){
var num=Math.floor(Math.floor(Math.random()*(m-n+1)+n))
return num;
}
function rotateFn(angles,txt){ //控制轮盘在angle度停下
bRotate=!bRotate;
$('#turntable').stopRotate();
$("#turntable").rotate({
angle:0, //旋转的角度
animateTo:angles+1800, //从当前角度旋转多少度
duration:3000, //持续时间
callback:function(){ //回调函数
alert(txt);
bRotate=!bRotate;
}
})
}
})
</script>
</html>
图片素材
使用rorate.js
// VERSION: 2.2 LAST UPDATE: 13.03.2012
/*
* Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
*
* Made by Wilq32, wilq32@gmail.com, Wroclaw, Poland, 01.2009
* Website: http://code.google.com/p/jqueryrotate/
*/
// Documentation removed from script file (was kinda useless and outdated)
(function($) {
var supportedCSS,styles=document.getElementsByTagName("head")[0].style,toCheck="transformProperty WebkitTransform OTransform msTransform MozTransform".split(" ");
for (var a=0;a<toCheck.length;a++) if (styles[toCheck[a]] !== undefined) supportedCSS = toCheck[a];
// Bad eval to preven google closure to remove it from code o_O
// After compresion replace it back to var IE = 'v' == 'v'
var IE = eval('"v"=="v"');
jQuery.fn.extend({
rotate:function(parameters)
{
if (this.length===0||typeof parameters=="undefined") return;
if (typeof parameters=="number") parameters={angle:parameters};
var returned=[];
for (var i=0,i0=this.length;i<i0;i++)
{
var element=this.get(i);
if (!element.Wilq32 || !element.Wilq32.PhotoEffect) {
var paramClone = $.extend(true, {}, parameters);
var newRotObject = new Wilq32.PhotoEffect(element,paramClone)._rootObj;
returned.push($(newRotObject));
}
else {
element.Wilq32.PhotoEffect._handleRotation(parameters);
}
}
return returned;
},
getRotateAngle: function(){
var ret = [];
for (var i=0,i0=this.length;i<i0;i++)
{
var element=this.get(i);
if (element.Wilq32 && element.Wilq32.PhotoEffect) {
ret[i] = element.Wilq32.PhotoEffect._angle;
}
}
return ret;
},
stopRotate: function(){
for (var i=0,i0=this.length;i<i0;i++)
{
var element=this.get(i);
if (element.Wilq32 && element.Wilq32.PhotoEffect) {
clearTimeout(element.Wilq32.PhotoEffect._timer);
}
}
}
});
// Library agnostic interface
Wilq32=window.Wilq32||{};
Wilq32.PhotoEffect=(function(){
if (supportedCSS) {
return function(img,parameters){
img.Wilq32 = {
PhotoEffect: this
};
this._img = this._rootObj = this._eventObj = img;
this._handleRotation(parameters);
}
} else {
return function(img,parameters) {
// Make sure that class and id are also copied - just in case you would like to refeer to an newly created object
this._img = img;
this._rootObj=document.createElement('span');
this._rootObj.style.display="inline-block";
this._rootObj.Wilq32 =
{
PhotoEffect: this
};
img.parentNode.insertBefore(this._rootObj,img);
if (img.complete) {
this._Loader(parameters);
} else {
var self=this;
// TODO: Remove jQuery dependency
jQuery(this._img).bind("load", function()
{
self._Loader(parameters);
});
}
}
}
})();
Wilq32.PhotoEffect.prototype={
_setupParameters : function (parameters){
this._parameters = this._parameters || {};
if (typeof this._angle !== "number") this._angle = 0 ;
if (typeof parameters.angle==="number") this._angle = parameters.angle;
this._parameters.animateTo = (typeof parameters.animateTo==="number") ? (parameters.animateTo) : (this._angle);
this._parameters.step = parameters.step || this._parameters.step || null;
this._parameters.easing = parameters.easing || this._parameters.easing || function (x, t, b, c, d) { return -c * ((t=t/d-1)*t*t*t - 1) + b; }
this._parameters.duration = parameters.duration || this._parameters.duration || 1000;
this._parameters.callback = parameters.callback || this._parameters.callback || function(){};
if (parameters.bind && parameters.bind != this._parameters.bind) this._BindEvents(parameters.bind);
},
_handleRotation : function(parameters){
this._setupParameters(parameters);
if (this._angle==this._parameters.animateTo) {
this._rotate(this._angle);
}
else {
this._animateStart();
}
},
_BindEvents:function(events){
if (events && this._eventObj)
{
// Unbinding previous Events
if (this._parameters.bind){
var oldEvents = this._parameters.bind;
for (var a in oldEvents) if (oldEvents.hasOwnProperty(a))
// TODO: Remove jQuery dependency
jQuery(this._eventObj).unbind(a,oldEvents[a]);
}
this._parameters.bind = events;
for (var a in events) if (events.hasOwnProperty(a))
// TODO: Remove jQuery dependency
jQuery(this._eventObj).bind(a,events[a]);
}
},
_Loader:(function()
{
if (IE)
return function(parameters)
{
var width=this._img.width;
var height=this._img.height;
this._img.parentNode.removeChild(this._img);
this._vimage = this.createVMLNode('image');
this._vimage.src=this._img.src;
this._vimage.style.height=height+"px";
this._vimage.style.width=width+"px";
this._vimage.style.position="absolute"; // FIXES IE PROBLEM - its only rendered if its on absolute position!
this._vimage.style.top = "0px";
this._vimage.style.left = "0px";
/* Group minifying a small 1px precision problem when rotating object */
this._container = this.createVMLNode('group');
this._container.style.width=width;
this._container.style.height=height;
this._container.style.position="absolute";
this._container.setAttribute('coordsize',width-1+','+(height-1)); // This -1, -1 trying to fix ugly problem with small displacement on IE
this._container.appendChild(this._vimage);
this._rootObj.appendChild(this._container);
this._rootObj.style.position="relative"; // FIXES IE PROBLEM
this._rootObj.style.width=width+"px";
this._rootObj.style.height=height+"px";
this._rootObj.setAttribute('id',this._img.getAttribute('id'));
this._rootObj.className=this._img.className;
this._eventObj = this._rootObj;
this._handleRotation(parameters);
}
else
return function (parameters)
{
this._rootObj.setAttribute('id',this._img.getAttribute('id'));
this._rootObj.className=this._img.className;
this._width=this._img.width;
this._height=this._img.height;
this._widthHalf=this._width/2; // used for optimisation
this._heightHalf=this._height/2;// used for optimisation
var _widthMax=Math.sqrt((this._height)*(this._height) + (this._width) * (this._width));
this._widthAdd = _widthMax - this._width;
this._heightAdd = _widthMax - this._height; // widthMax because maxWidth=maxHeight
this._widthAddHalf=this._widthAdd/2; // used for optimisation
this._heightAddHalf=this._heightAdd/2;// used for optimisation
this._img.parentNode.removeChild(this._img);
this._aspectW = ((parseInt(this._img.style.width,10)) || this._width)/this._img.width;
this._aspectH = ((parseInt(this._img.style.height,10)) || this._height)/this._img.height;
this._canvas=document.createElement('canvas');
this._canvas.setAttribute('width',this._width);
this._canvas.style.position="relative";
this._canvas.style.left = -this._widthAddHalf + "px";
this._canvas.style.top = -this._heightAddHalf + "px";
this._canvas.Wilq32 = this._rootObj.Wilq32;
this._rootObj.appendChild(this._canvas);
this._rootObj.style.width=this._width+"px";
this._rootObj.style.height=this._height+"px";
this._eventObj = this._canvas;
this._cnv=this._canvas.getContext('2d');
this._handleRotation(parameters);
}
})(),
_animateStart:function()
{
if (this._timer) {
clearTimeout(this._timer);
}
this._animateStartTime = +new Date;
this._animateStartAngle = this._angle;
this._animate();
},
_animate:function()
{
var actualTime = +new Date;
var checkEnd = actualTime - this._animateStartTime > this._parameters.duration;
// TODO: Bug for animatedGif for static rotation ? (to test)
if (checkEnd && !this._parameters.animatedGif)
{
clearTimeout(this._timer);
}
else
{
if (this._canvas||this._vimage||this._img) {
var angle = this._parameters.easing(0, actualTime - this._animateStartTime, this._animateStartAngle, this._parameters.animateTo - this._animateStartAngle, this._parameters.duration);
this._rotate((~~(angle*10))/10);
}
if (this._parameters.step) {
this._parameters.step(this._angle);
}
var self = this;
this._timer = setTimeout(function()
{
self._animate.call(self);
}, 10);
}
// To fix Bug that prevents using recursive function in callback I moved this function to back
if (this._parameters.callback && checkEnd){
this._angle = this._parameters.animateTo;
this._rotate(this._angle);
this._parameters.callback.call(this._rootObj);
}
},
_rotate : (function()
{
var rad = Math.PI/180;
if (IE)
return function(angle)
{
this._angle = angle;
this._container.style.rotation=(angle%360)+"deg";
}
else if (supportedCSS)
return function(angle){
this._angle = angle;
this._img.style[supportedCSS]="rotate("+(angle%360)+"deg)";
}
else
return function(angle)
{
this._angle = angle;
angle=(angle%360)* rad;
// clear canvas
this._canvas.width = this._width+this._widthAdd;
this._canvas.height = this._height+this._heightAdd;
// REMEMBER: all drawings are read from backwards.. so first function is translate, then rotate, then translate, translate..
this._cnv.translate(this._widthAddHalf,this._heightAddHalf); // at least center image on screen
this._cnv.translate(this._widthHalf,this._heightHalf); // we move image back to its orginal
this._cnv.rotate(angle); // rotate image
this._cnv.translate(-this._widthHalf,-this._heightHalf); // move image to its center, so we can rotate around its center
this._cnv.scale(this._aspectW,this._aspectH); // SCALE - if needed ;)
this._cnv.drawImage(this._img, 0, 0); // First - we draw image
}
})()
}
if (IE)
{
Wilq32.PhotoEffect.prototype.createVMLNode=(function(){
document.createStyleSheet().addRule(".rvml", "behavior:url(#default#VML)");
try {
!document.namespaces.rvml && document.namespaces.add("rvml", "urn:schemas-microsoft-com:vml");
return function (tagName) {
return document.createElement('<rvml:' + tagName + ' class="rvml">');
};
} catch (e) {
return function (tagName) {
return document.createElement('<' + tagName + ' xmlns="urn:schemas-microsoft.com:vml" class="rvml">');
};
}
})();
}
})(jQuery);
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