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| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>转盘抽奖</title> | |
| <style> | |
| *, | |
| *::before, | |
| *::after { | |
| margin: 0; | |
| padding: 0; | |
| box-sizing: border-box; | |
| } | |
| html { | |
| height: 100%; | |
| background: #264563; | |
| } | |
| .luckdraw { | |
| width: 300px; | |
| height: 300px; | |
| position: relative; | |
| margin: 100px auto; | |
| border-radius: 50%; | |
| overflow: hidden; | |
| } | |
| .luckpanel { | |
| position: relative; | |
| width: 100%; | |
| height: 100%; | |
| transition: transform 3s ease-in-out; | |
| } | |
| #canvas { | |
| position: relative; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| #canvas .sector-item { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| width: 50%; | |
| height: 50%; | |
| transform-origin: right bottom; | |
| overflow: hidden; | |
| } | |
| /* #canvas .sector-item:nth-child(odd) { | |
| background: pink; | |
| } | |
| #canvas .sector-item:nth-child(even) { | |
| background: skyblue; | |
| } */ | |
| .prize { | |
| position: absolute; | |
| top: 0; | |
| left: 50%; | |
| width: 50%; | |
| height: 50%; | |
| transform: translateX(-50%); | |
| } | |
| .prize-item { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| width: 100%; | |
| height: 100%; | |
| transform-origin: center bottom; | |
| } | |
| .prize-item__name { | |
| position: absolute; | |
| top: 20px; | |
| left: 10px; | |
| width: calc(100% - 20px); | |
| font-size: 12px; | |
| text-align: center; | |
| color: #ff572f; | |
| } | |
| .prize-item__img { | |
| position: absolute; | |
| top: 50px; | |
| left: calc(50% - 30px /2); | |
| width: 30px; | |
| height: 30px; | |
| } | |
| .prize-item__img img { | |
| width: 100%; | |
| height: 100%; | |
| vertical-align: bottom; | |
| } | |
| /* 抽奖 */ | |
| .pointer { | |
| position: absolute; | |
| left: 50%; | |
| top: 50%; | |
| transform: translate(-50%, -50%); | |
| width: 90px; | |
| height: 90px; | |
| background-color: orange; | |
| border-radius: 50%; | |
| display: flex; | |
| justify-content: center; | |
| align-items: center; | |
| font-size: 30px; | |
| font-weight: bold; | |
| cursor: pointer; | |
| user-select: none; | |
| } | |
| .pointer::after { | |
| content: ''; | |
| position: absolute; | |
| top: -70px; | |
| border: 40px solid orange; | |
| border-left-width: 10px; | |
| border-right-width: 10px; | |
| border-left-color: transparent; | |
| border-top-color: transparent; | |
| border-right-color: transparent; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="luckdraw"> | |
| <div class="luckpanel"> | |
| <div id="canvas"></div> | |
| <div class="prize"> | |
| <!-- <div class="prize-item"> | |
| <div class="prize-item__name">奖品</div> | |
| <div class="prize-item__img"> | |
| <img | |
| src="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d" | |
| alt=""> | |
| </div> | |
| </div> --> | |
| </div> | |
| </div> | |
| <div class="pointer">抽奖</div> | |
| </div> | |
| <script> | |
| const consts = { | |
| // 奖品清单 | |
| prizeList: [ | |
| // { | |
| // prizeName: '休息多5分钟', | |
| // // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| // count: 10, | |
| // }, | |
| // { | |
| // prizeName: '休息多10分钟', | |
| // // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| // count: 5, | |
| // }, | |
| { | |
| prizeName: '托马斯1集', | |
| // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| count: 6, | |
| }, | |
| { | |
| prizeName: '丁丁1集', | |
| // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| count: 3, | |
| }, | |
| { | |
| prizeName: '小熊15分钟', | |
| // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| count: 5, | |
| }, | |
| { | |
| prizeName: '读书写字画画10分钟', | |
| // prizeImg: 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.it168.com%2Fn%2F640x480%2F6%2F6414%2F6414197.jpg&refer=http%3A%2F%2Fimage.it168.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1640667263&t=18bb80a694a5ff966713191b4a81745d', | |
| count: 2, | |
| } | |
| ], | |
| // 每一块扇形的背景色 | |
| prizeBgColors: [ | |
| 'rgb(255,231,149)', | |
| 'rgb(255,247,223)', | |
| 'rgb(255,231,149)', | |
| 'rgb(255,247,223)', | |
| 'rgb(255,231,149)', | |
| 'rgb(255,247,223)', | |
| 'rgb(255,231,149)', | |
| 'rgb(255,247,223)', | |
| ], | |
| // 每一块扇形的外边框颜色 | |
| borderColor: '#ff9800' | |
| } | |
| const prizeNum = consts.prizeList.length | |
| let itemAngle = 360 / prizeNum // 每个扇形区域的角度 | |
| const offsetAngle = itemAngle / 2 | |
| let isRotating = false | |
| const circleCount = 3 // 旋转圈数 | |
| const rotateDuration = 3 // 持续时间 | |
| const panel = document.querySelector('.luckpanel') | |
| // 画出扇形骨架 | |
| function drawPanel() { | |
| let fragMent = document.createDocumentFragment() | |
| consts.prizeList.forEach((item, index) => { | |
| let itemDom = document.createElement('div') | |
| itemDom.setAttribute('class', 'sector-item') | |
| itemDom.style.background = `${consts.prizeBgColors[index]}` | |
| itemDom.style.borderBottom = `1px solid ${consts.borderColor}` | |
| itemDom.style.transform = `rotate(${itemAngle * (index + 1)}deg) skewY(${90 - itemAngle}deg)` | |
| fragMent.appendChild(itemDom) | |
| }) | |
| document.getElementById('canvas').appendChild(fragMent) | |
| } | |
| function getPrizeItem({ name, src }) { | |
| const el = document.createElement('div') | |
| let tpl = '' | |
| if(src){ | |
| tpl = ` | |
| <div class="prize-item"> | |
| <div class="prize-item__name">${name}</div> | |
| <div class="prize-item__img"> | |
| <img | |
| src="${src}" | |
| alt=""> | |
| </div> | |
| </div> | |
| ` | |
| } | |
| else{ | |
| tpl = ` | |
| <div class="prize-item"> | |
| <div class="prize-item__name">${name}</div> | |
| <div class="prize-item__img"> | |
| </div> | |
| </div> | |
| ` | |
| } | |
| el.innerHTML = tpl | |
| return el.firstElementChild | |
| } | |
| // 填充奖品内容 | |
| function fillPrize() { | |
| const container = document.querySelector('.prize') | |
| consts.prizeList.forEach((item, i) => { | |
| const el = getPrizeItem({ | |
| name: item.prizeName, | |
| src: item.prizeImg | |
| }) | |
| // 旋转 | |
| const currentAngle = itemAngle * i + offsetAngle | |
| el.style.transform = `rotate(${currentAngle}deg)` | |
| container.appendChild(el) | |
| }) | |
| } | |
| // 获得哪一个奖品 | |
| function getPrizeIndex(prizeList) { | |
| // 中奖的是哪一个奖品 | |
| let index = 0 | |
| // 当前奖品总数量 | |
| let prizeTotalNum = 0 | |
| for (let i = 0; i < prizeList.length; i++) { | |
| prizeTotalNum += prizeList[i].count | |
| } | |
| if (prizeTotalNum === 0) { | |
| alert('奖品已抽完'); | |
| return index = -1 | |
| } | |
| // 产生一个随机数 0-总数 | |
| let random = parseInt(Math.random() * prizeTotalNum) | |
| // 当前奖品的概率区间 | |
| let currentWeight = 0 | |
| for (let i = 0; i < prizeList.length; i++) { | |
| currentWeight += prizeList[i].count | |
| if (random < currentWeight) { | |
| index = i | |
| prizeList[i].count-- | |
| break | |
| } | |
| } | |
| return index | |
| } | |
| // 抽奖事件 | |
| function bindEvent() { | |
| document.querySelector('.pointer').addEventListener('click', function () { | |
| if (isRotating) { | |
| return | |
| } else { | |
| isRotating = true | |
| } | |
| const index = getPrizeIndex(consts.prizeList) | |
| console.log('index', index); | |
| if (index === -1) { | |
| isRotating = false | |
| } else { | |
| console.log('奖品名称', consts.prizeList[index].prizeName); | |
| rotate(index) | |
| } | |
| }) | |
| } | |
| // 旋转转盘 | |
| let statrtRotatAngle = 0 | |
| function rotate(index) { | |
| // statrtRotatAngle % 360 上一次旋转到index的度数 | |
| // statrtRotatAngle - statrtRotatAngle % 360 得到一个度数为 360*n | |
| // 旋转到索引index商品的度数 | |
| let angleToIndex = 360 - (offsetAngle + itemAngle * index) | |
| const rotateAngle = statrtRotatAngle - statrtRotatAngle % 360 + circleCount * 360 + angleToIndex | |
| statrtRotatAngle = rotateAngle | |
| panel.style.transform = `rotate(${rotateAngle}deg)` | |
| panel.style.transitionDuration = `${rotateDuration}s` | |
| setTimeout(() => { | |
| isRotating = false | |
| }, 1000) | |
| } | |
| function init() { | |
| // 画出扇形骨架 | |
| drawPanel() | |
| // 填充奖品内容 | |
| fillPrize() | |
| // 抽奖事件 | |
| bindEvent() | |
| document.onkeydown = function (event) { | |
| if(event.key === 'm'){ | |
| window.location.href = 'math.html' | |
| } | |
| } | |
| } | |
| document.addEventListener('DOMContentLoaded', init) | |
| </script> | |
| </body> | |
| </html> |