Javascript返回顶部和砸金蛋，跑马灯等游戏代码实现

1. 我们经常写页面的时候会遇到页面很长需要做返回顶部的操作：
$("id /class").animate({scrollTop:$('.class').offset().top},2000)

$(".sign,.sign-b,.title-d").click(function(){
    $('html,body').animate({scrollTop:$('.Lp2loding').offset().top},2000);
});

2.砸金蛋活动

砸金蛋活动程序实现，一般的砸金蛋页面都包含完整的蛋和破碎的蛋以及锤子等图片。

砸金蛋包含的奖品，做到随机不重复的出现。如果需要记录奖品的值，需建立向后台数据库传值。
现在我的程序只涉及前端程序。

前端动画代码部分：

HTML：
<div class="block1">
        <div class="eggs">
            <ul class="eggs-1">
                <li><img class="egg" src="images/eggs.png"></li>
                <li><img class="egg" src="images/eggs.png"></li>
                <div class="clear"></div>
            </ul>
            <ul class="eggs-2">
                <li><img class="egg" src="images/eggs.png"></li>
                <li><img class="egg" src="images/eggs.png"></li>
                <li><img class="egg" src="images/eggs.png"></li>
                <div class="clear"></div>
            </ul>
            <div class="chick">
                <div class="chick-success">
                    <img src="images/chick.png">
                    <div id="text"></div>
                    <div class="jp">兑换奖品</div>
                </div>
                <div class="close">X</div>
            </div>
        </div>
        <p>您还有 <span id="chance">5</span>次砸蛋机会</p>
    </div>
Animation CSS：
/**animation css**/
.overlay,.overlay2 { 100%;height: 100%;position: fixed;background: rgba(0,0,0,0.5);z-index: 6;display: none;}
.overlay2{z-index: 11;}
.hammer {
    position: absolute;
    z-index: 10;
    left: 50%;
    top: 0%;
    opacity:0;
    max- none;

    -webkit-animation: hammer 0.5s alternate;
    animation: hammer 0.5s alternate;
    transform-origin: bottom right;
    -webkit-transform-origin: bottom right;

}
.egg{cursor:pointer;}
.egg-po {
    display: block;
    max- none;
    display: none;
}
.eggs{position: relative;}
.chick{display: none;z-index: 10;position: absolute;top: 0%;left: 50%;margin-left: -350px;}
div#text {
    color: #fff;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 1px 1px 0px #ca1414, -1px -1px 0px #ca1414, 1px 3px 0px #ca1414, -1px -3px 0px #ca1414, 3px 3px 0px #ca1414, -3px -3px 0px #ca1414;
        margin-top: -36%;
    text-align: center;
}
.close,.close-f {font-size: 24px;top: 20%;right: 20%; 30px;height: 30px;line-height: 30px;color: #fff;background: #ff0000;border-radius: 50px;position: absolute;cursor:pointer;}
.close-f {top: -30px;right: -30px;}
.jp {
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    background: #ca1414;
    display: inline-block;
    padding: 0 40px;
    border-radius: 10px;
    line-height: 35px;
    cursor: pointer;
    margin-top: 20px;
}
@keyframes hammer
{
     0%
    {
        opacity: 1;
    }

    50%
    {
        transform: rotate(-15deg);
        opacity: 1;
    }
    70%
    {
        opacity: 1;
    }
    90%
    {
        opacity: 1;
    }
 100%
    {
        opacity: 0;
    }
}
@-webkit-keyframes hammer
{
     0%
    {
        opacity: 1;
    }
    50%
    {
        -webkit-transform: rotate(-15deg);
        opacity: 1;
    }
    100%
    {
       opacity: 0;
    }
}

JS动态效果实现

<script type="text/javascript">
//多少次砸蛋的机会
    var chance=5;
    $("#chance").text(chance);
//设置奖品，每砸蛋一次砸中奖品从数组中删除，从剩下的奖品中重新抽，保证抽取的奖品不重复
    var msg = ["获得1000美元赠金","获得500元京东卡","获得U盘+高级笔+充电宝","获得保温杯","获得外汇交易书+高级伞+手机支架+海马刀"]                
    for(let i=0;i<5;i++){
       function gift(){
            var num=Math.floor(Math.random() * msg.length);
            bb=msg.splice(num,1);
            // console.log(num,bb,msg.length)
            }
        } 
//设置主逻辑chance控制次数，gift（）奖品，点击蛋之后，原来的蛋消失，锤子和破蛋出现
        function aClick() {
            // $(".eggs li").off("click", aClick);  
            gift(); 
            chance-=1;
            $("#chance").text(chance);

            if(chance<0){
                chance = 0;
                $("#chance").text(chance);
                $(".egg ").on("click", aClick);
            }
            else {           
                var _this = $(this);
                var eggli=_this.parent('li');
                eggli.html('<img src="images/hammer.png" class="hammer"><img src="images/egg-po.png" class="egg-po" display="block">');

                setTimeout(function () {
                    eggli.find(".egg-po").show();
//再次设置setTimeout，填写所剩次数，弹出遮罩层，以及小鸡填写信息表等


                    setTimeout(function () {
                            $(".overlay").show();
                            $("#text").html(bb);
                            $(".chick").show();
                          
                    },500);
                },250);

                $(".close").click(function () {
                    $(".overlay,.chick").hide();
                })
                $(".jp").click(function(){
                    // $(".overlay").css({'z-index':"11"});
                    $(".overlay2,.form-sign").show();
                })
                 $(".close-f").click(function () {
                     $(".overlay,.overlay2,.form-sign,.chick").hide();
                 })
            }

        }
           $(".egg").on("click", aClick);

</script>

3.程序设计

此时需要三张背景图相同的背景图 

<style>
   *{padding: 0;margin: 0;}
    #slotmachine_wrapper {
    width:100%;
    background: url(gift-bg.jpg)top center no-repeat;
}

#slotmachine {
    width:100%;
    max-width:1200px;
    position: relative;
  margin:0 auto;
}
/*Play Button*/
#play_button{
    background: url(button.png)top center no-repeat;
    width: 388px;
    height: 126px;
    cursor: pointer;
    margin: 55px auto 0;
} 
.reels {
    margin:0 auto;
    width: 100%;
    font-size:0;
    position: absolute;
    top: 28%;

}
/*Slot Reel holder*/
.center {
    width: 666px;
    margin: 0 auto;
    padding: 40px 0;
    position: relative;
    z-index: 2;
}
/*Reels */
.slot {
    font-size:0;
    display:inline-block;
    width:208px;
    height:286px;
    position:relative;
    top:8px;
}
.slot_title{text-indent: -99999px;font-size: 0;}
#reel_one,#reel_two,#reel_three {
    background:url(gift.jpg);
    background-repeat:repeat-y;
    zoom: .8;
    margin: 0 23px;
    box-shadow: 0 0 50px #cbbdbf;
    border-radius: 10px;
}
#reel_one{background-position:0 0;}
#reel_two {background-position:0 286px;margin: 0 50px;}
#reel_three {background-position:0 858px;}
.reelOneAnimation{
    animation:animatedBackground .3s linear infinite;
    -webkit-animation:animatedBackground .3s linear infinite;
    -moz-animation:animatedBackground .3s linear infinite;
    -o-animation:animatedBackground .3s linear infinite;
}
.reelTwoAnimation{
    animation:animatedBackground 1s linear infinite;
    -webkit-animation:animatedBackground 1s linear infinite;
    -moz-animation:animatedBackground 1s linear infinite;
    -o-animation:animatedBackground 1s linear infinite;
}
.reelThreeAnimation {
    animation:animatedBackground .5s linear infinite;
    -webkit-animation:animatedBackground .5s linear infinite;
    -moz-animation:animatedBackground .5s linear infinite;
    -o-animation:animatedBackground .5s linear infinite;
}
.overlay {
    width: 100%;
    height: 100%;
    position: fixed;
    background: rgba(0,0,0,0.5);
    z-index: 3;

}
.close {
    color: #bbcff2;
    font-size: 20px;
    top: 40px;
    position: absolute;
    right: 10px;
    border-radius: 100%;
    border: 1px solid;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
}
.form-hover,.overlay{display: none;}
/*Animation for reels */
@keyframes animatedBackground {
from {
    background-position:0 0;
}

to {
    background-position:0 1000%;
}
}

@-webkit-keyframes animatedBackground {
from {
    background-position:0 1000%;
}

to {
    background-position:0 0;
}
}

@-moz-keyframes animatedBackground {
from {
    background-position:0 1000%;
}

to {
    background-position:0 0;
}
}

@-o-keyframes animatedBackground {
from {
    background-position:0 1000%;
}

to {
    background-position:0 0;
}
}
/*Slot Machine foot*/
.slot_foot {
    width:110%;
    height:40px;
    background:#000;
    margin:0 auto;
    position:relative;
  margin-left:-5%;
}
</style>
<div class="overlay"></div>
        <div id="slotmachine_wrapper">
            <h1 class="slot_title">
                Facebook lottery
            </h1>
            <!-- Slot machine sign and lights-->
            <div id="slotmachine">
                <img class="img-pc" src="gift-img.jpg">
                <img class="img-m" src="gift-m-img.jpg">
                <!-- Reels-->
                <div class="reels">
                    <div class="reels_bk">
                        <div class="center">
                            <div class="slot" id="reel_one">
                            </div>

                            <div class="slot" id="reel_two">
                            </div>

                            <div class="slot" id="reel_three">
                            </div>
                        </div>
                    </div>
                    <div id="play_button" >
                </div>
                </div>    
   </div>
</div>

Js部分控制出现的奖品，并弹出表单已获得联系信息

<script>
(function espressoBarSlot() {
        //Background position for reels
         var reelGift = ['$100000模拟赠金', '免费体验模拟账户', '$50000模拟赠金', '免费体验真实账户', '市场价$200在线交易课堂','$10000模拟赠金','1个月交易教学直播会员','专业分析师30分钟电话指导',];
        var randomNum = Math.floor(Math.random() * 8)
        var randomReelOne = -286*randomNum;
        //Play click event
        $('#play_button').click(function() {
            $('#play_button').unbind('click');

           //make button unclickable while game is in play
            //add animation to the reels
            $('#reel_one').addClass('reelOneAnimation');
            $('#reel_two').addClass('reelTwoAnimation');
            $('#reel_three').addClass('reelThreeAnimation');
            //Time out for reel one
            setTimeout(function() {

                $('.reelOneAnimation').css(
                    //set background position by applying randomReelOne value to the reelPosition array.
                    'background-position', '0 ' +randomReelOne+ 'px'
                ).removeClass('reelOneAnimation');
            }, 1000);

            //Time out for reel two
            setTimeout(function() {
                $('.reelTwoAnimation').css(
                    //set background position by applying randomReelTwo value to the reelPosition array.
                    'background-position', '0 ' +randomReelOne + 'px'
                ).removeClass('reelTwoAnimation');
            }, 2000);

            //Time out for reel three and display if user has won or lost
            setTimeout(function() {
                $('.reelThreeAnimation').css(
                    //set background position by applying randomReelThree value to the reelPosition array.
                    'background-position', '0 ' +randomReelOne + 'px'
                ).removeClass('reelThreeAnimation');
   
                    //Decide what the user has won.
                        $('.overlay,.form-hover').fadeIn()
                        $('.form-title').html('恭喜你，“'+reelGift[randomNum]+'”奖已放入您的账户，快来注册领取吧！')
                        console.log(randomNum,randomReelOne,reelGift[randomNum]);
                espressoBarSlot();
            }, 4000);
            
            
        });
    })();
var num=1;
$('.close').click(function(){
if(num>=3){alert('您的抽奖次数已用尽！');return false;}
num++;
    $('.overlay,.form-hover').fadeOut()
})

</script>

4.九宫格跑马灯游戏：

<!DOCTYPE html>
<html>

<head>
    <meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport">
    <title>Document</title>
    <style>
        .luck-0{
            background: #ef88ab;
        }
        .luck-1{
            background: #e578f5;
        }
        .luck-2{
            background: #534bf1;
        }
        .luck-3{
            background: #4bc6f1;
        }
        .luck-4{
            background: #4bf1c1;
        }
        .luck-5{
            background: #aeec2b;
        }
        .luck-6{
            background: #f5f519;
        }
        .luck-7{
            background: #e4820e;
        }
        #luckStage {
    width: 300px;
    height: 300px;
    margin: 0px auto;
    border: 2px solid #f90;
}

#luckStage table td {
    position: relative;
    width: 100px;
    height: 100px;
    text-align: center;
    /* border: 1px #ccc solid; */
    font-size: 20px;
}

#luckStage table td a {
    width: 100px;
    height: 100px;
    display: block;
    background: red;
    opacity: .7;
    line-height: 100px;
}
#luckStage table td a:hover{
    opacity: 1;
}

#luckStage table td.active .mask {
    display: block;
}

.mask {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background: rgba(0, 0, 0, .8);
    display: none;
}

    </style>
</head>

<body>
    <div id="luckStage">
        <table border="0" cellpadding="0" cellspacing="0">
            <tr>
                <td class="luck-cell luck-0">0
                    <div class="mask"></div>
                </td>
                <td class="luck-cell luck-1">1
                    <div class="mask"></div>
                </td>
                <td class="luck-cell luck-2">2
                    <div class="mask"></div>
                </td>
            </tr>
            <tr>
                <td class="luck-cell luck-7">7
                    <div class="mask"></div>
                </td>
                <td>
                    <a href="javascript:;" id="btn-start">click</a>
                </td>
                <td class="luck-cell luck-3">3
                    <div class="mask"></div>
                </td>
            </tr>
            <tr>
                <td class="luck-cell luck-6">6
                    <div class="mask"></div>
                </td>
                <td class="luck-cell luck-5">5
                    <div class="mask"></div>
                </td>
                <td class="luck-cell luck-4">4
                    <div class="mask"></div>
                </td>
            </tr>
        </table>
    </div>
    <script type="text/javascript" src="http://cdn.bootcss.com/jquery/3.1.0/jquery.min.js"></script>
    <script>
    //main js
    function random(n, m){
    var c = m-n+1;  
    return Math.floor(Math.random() * c + n);
}

function Luck(id) {
    this.index = -1; //当前位置索引
    this.cells = 0; //总共有多少个位置
    this.timer = null; //定时器id
    this.speed = 120; //初始转动速度
    this.times = 0; //转动次数
    this.baseTimes = random(80, 120); //至少转动次数
    this.prize = random(0, 7); //中奖位置
    this.init(id);
}
Luck.prototype = {
    init: function(id) {
        if (!id) {
            throw new Error("params id is null, this is should has a id!")
        }
        this.obj = $("#" + id);
        this.cells = this.obj.find(".luck-cell").length;
        this.obj.find(".luck-" + this.index).addClass("active");
    },
    clear: function (){
        this.speed = 20;
        this.times = 0;
        this.baseTimes = random(80, 100);
        this.prize = random(0, 7);
    },
    setActive: function() {
        var index = this.index;
        var cells = this.cells;
        var obj = this.obj;
        obj.find(".luck-" + index).removeClass("active");
        index += 1;
        if (index > cells - 1) {
            index = 0;
        };
        obj.find(".luck-" + index).addClass("active");
        this.index = index;
    },
    run: function(callback) {
        this.times += 1;
        this.setActive();
        
        if (this.times > this.baseTimes+8 && this.prize == this.index) {
            clearTimeout(this.timer);
            this.clear();
            typeof callback == 'function' && callback();
        } else {
            if(this.times < this.baseTimes){
                this.speed -= 5;
            }else{
                this.speed += 25;
            }
            if(this.speed < 20){
                this.speed = 20;
            }
            this.timer = setTimeout(this.run.bind(this, callback), this.speed);
        }
    }
}
        var myLuck = new Luck("luckStage");
        var clicked = false;
        $("#btn-start").on("click", function (){
            if(clicked){
                return ;
            }
            clicked = true;
            myLuck.run(function (){
                clicked = false;
            });
        })
    </script>
</body>

</html>