转盘抽奖游戏

最新推荐文章于 2020-11-21 04:08:51 发布

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最新推荐文章于 2020-11-21 04:08:51 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/lvxisha/p/9885782.html

demo1：

1.通过设置CSS样式的position属性，z-index属性等实现背景图，转盘图与指针图的层叠摆放；

2、通过设置元素style.transform = "rotate(0deg)"实现旋转效果；

代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
   
    <title>转盘抽奖</title>
  
    <style>
        #bg {
            width: 650px;
            height: 600px;
            margin: 0 auto;
            background: url(turntable-bg.jpg) no-repeat;
            position: relative;
        }

        img[src^="pointer"] {
            position: absolute;
            z-index: 10;
            top: 155px;
            left: 247px;
        }

        img[src^="turntable"] {
            position: absolute;
            z-index: 5;
            top: 60px;
            left: 116px;
            transition: all 4s;
        }
    </style>
</head>
<body>
    <div id="bg"><img src="pointer.png" alt="pointer"><img src="turntable.png" alt="turntable"></div>  
    <script>
        var oPointer = document.getElementsByTagName("img")[0];
        var oTurntable = document.getElementsByTagName("img")[1];
        var cat = 360/7; //总共7个扇形区域，每个区域角度
        var num = 0; //转圈结束后停留的度数
        var offOn = true; //是否正在抽奖
        oPointer.onclick = function () {
            if (offOn) {//正在抽奖
                oTurntable.style.transform = "rotate(0deg)";
                offOn = !offOn;//转盘停止转动
                ratating();//调用旋转函数
            }
        }
        //旋转
        function ratating() {
            var timer = null;
            var rdm = 0; //随机度数
            clearInterval(timer);
            timer = setInterval(function () {
                if (Math.floor(rdm / 360) < 3) { 
                    rdm = Math.floor(Math.random() * 3600);
                    //console.log("rdm:==="+rdm);
                } else {
                    oTurntable.style.transform = oTurntable.style.webkitTransform= "rotate(" + rdm + "deg)";
                    clearInterval(timer);
                    setTimeout(function () {
                        offOn = !offOn;
                        num = rdm % 360;
                        if (num <= cat * 1) {
                            alert("4999元");
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "4999元");
                        } else if (num <= cat * 2) { 
                            alert("50元"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "50元"); 
                        } else if (num <= cat * 3) { 
                            alert("10元"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "10元"); 
                        } else if (num <= cat * 4) { 
                            alert("5元"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "5元"); 
                        }
                        else if (num <= cat * 5) { 
                            alert("免息服务"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "免息服务");
                        }
                        else if (num <= cat * 6) { 
                            alert("提交白金"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "提交白金"); 
                        }
                        else if (num <= cat * 7) { 
                            alert("未中奖"); 
                            console.log("rdm=" + rdm + "，num=" + num + "，" + "未中奖"); 
                        }
                    }, 4000);
                }
            }, 30);
        }
    </script>
</body>
</html>

　　运行效果：点击抽奖转盘旋转

素材：

demo2：

涉及知识点：

贝塞尔曲线

cubic-bezier还是比较少用到，PC端中，有浏览器不兼容。但是手机端中，可以使用并带来炫酷的动画及体验。

缓动函数速查表： http://www.xuanfengge.com/easeing/easeing/
Ceaser： http://xuanfengge.com/easeing/ceaser/
cubic-bezier：http://cubic-bezier.com/

cubic-bezier即为贝塞尔曲线中的绘制方法。图上有四点，P0-3，其中P0、P3是默认的点，对应了[0,0], [1,1]。而剩下的P1、P2两点则是我们通过cubic-bezier()自定义的。cubic-bezier(x1, y1, x2, y2) 为自定义，x1,x2,y1,y2的值范围在[0, 1];

在CSS3中，常用的几个动画效果，用cubic-bezier表示分别为：

ease: cubic-bezier(0.25, 0.1, 0.25, 1.0)
linear: cubic-bezier(0.0, 0.0, 1.0, 1.0)
ease-in: cubic-bezier(0.42, 0, 1.0, 1.0)
ease-out: cubic-bezier(0, 0, 0.58, 1.0)
ease-in-out: cubic-bezier(0.42, 0, 0.58, 1.0)

CSS3中，动画属性为transition，常用动画如下：

.demo2{

top: 100px;

-webkit-transition: all 600ms cubic-bezier(0.47, 0, 0.745, 0.715);

transition: all 600ms cubic-bezier(0.47, 0, 0.745, 0.715);

}

代码：

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>转盘抽奖</title>
	<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="IE=edeg">
	<!-- 浏览器兼容版本 -->

		
		<style>
            * {
                margin: 0;
                padding: 0;
            }
            div{
            	 
            }
            .rotate_con {
                margin: 50px auto;
                width: 320px;
                height: 320px;
                
            }
            
            .rotate_row {
                display: flex;
                display: -webkit-flex;
                height: 33.3333333%;
            }
            
            .rotate_item {
                flex: 0 0 33.3333333%;
                -webkit-flex: 0 0 33.3333333%;
                line-height: 106.666666px;
                text-align: center;
                background: yellow;
                padding: 1px;
                border: 1px solid #fff;
                box-sizing: border-box;
            }
            
            .item_start {
                position: relative;
                background-color: #FF5E5E;
                color: #FFFFFF;
                font-weight: bold;
                cursor: pointer;
                border-radius: 50%;
            }
            
            .item_start:active {
                background: #ED745B;
            }
            
            .rotate {
                position: absolute;
                width: 5px;
                height: 106px;
                top: -53px;
                left: 53px;
                background: yellowgreen;
                transform: rotateZ(0deg);
                transform-origin: left bottom;
                -webkit-transform-origin: left bottom;
                transition: all 1.5s cubic-bezier(0.25, 0.1, 0.25, 1);
            }
            
            .item_active {
                border-color: red;
            }
        </style>
</head>
<body>

	<div class="rotate_con">
            <div class="rotate_row">
                <div class="rotate_item">
                    RMB100
                </div>
                <div class="rotate_item">
                    流量100M
                </div>
                <div class="rotate_item">
                    谢谢参与
                </div>
            </div>
            <div class="rotate_row">
                <div class="rotate_item">
                    再接再厉
                </div>
                <div class="rotate_item item_start" id="start">
                    开始
                    <div class="rotate" id="rotate_zhen">

                    </div>
                </div>
                <div class="rotate_item">
                    RMB2
                </div>
            </div>
            <div class="rotate_row">
                <div class="rotate_item">
                    RMB100
                </div>
                <div class="rotate_item">
                    谢谢参与
                </div>
                <div class="rotate_item">
                    流量100M
                </div>
            </div>
        </div>

	<script>
		//获取对象
        var getid = function(id) {
               return document.getElementById(id);
           };
           //按照旋转顺序的数组
           var context = ["流量100M", "谢谢参与", "RMB2", "流量100M", "谢谢参与", "RMB100", "再接再厉", "RMB100"];
           var deg = 45, //旋转的默认角度360/8
               numdeg = 0, //记录上次旋转停止时候的角度
               num = 0, //记录旋转后数组的位置
                isRotated = false; //判断是否在进行中
           window.onload = function() {
               var zhen = getid("rotate_zhen");
               getid("start").addEventListener('click', function() {
                   if(isRotated) return; //如果正在旋转退出程序
                   isRotated = true;
                   var index = Math.floor(Math.random() * 8); //得到0-7随机数
                   num = index + num; //得到本次位置
                   numdeg += index * deg + Math.floor(Math.random() * 3 + 1) * 360;
                    zhen.style.webkitTransform = zhen.style.transform = "rotateZ(" + numdeg + "deg)";
                   setTimeout(function() {
                       if(num >= 8) { //如果数组位置大于7就重新开始
                          num = num % 8;
                       }
                      alert(context[num]);
                       isRotated = false; //旋转改为false说明没有旋转
                 }, 1700)
               }, false)
           }
	</script>
</body>
</html>