Home >Web Front-end >HTML Tutorial >JavaScript 实现彩票中随机数组的获取_html/css_WEB-ITnose
JavaScript 实现彩票中随机数组的获取_html/css_WEB-ITnose
- WBOYOriginal
- 2016-06-24 11:30:111158browse
1.效果图：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Math.random方法彩票随机数的生成</title></head><body> <!-- 设置样式 --> <input type="text" id="text"> <button id="btnGo">开始</button> <button id="btnStop">获取随机数组</button> <script type="text/javascript"> //获取节点 var btnGo = document.getElementById("btnGo"); var btnStop = document.getElementById("btnStop"); var text = document.getElementById("text"); //定义生成最小到最大值的随机函数 function rand(min,max){ return parseInt(Math.random()*( max - min + 1) + min); } function start(min,max,length){ //定义空数组 var arr = []; while(arr.length<length){ //生成一个随机数prem var prem=rand(min,max); //判断生成的随机数prem是否在数组arr里,果然不在，就将这个随机数插入到数组里，如果在，执行下一次循环 if(arr.indexOf(prem) == -1){ arr.push(prem); } } //返回数组arr return arr; } var timer = 0; //单击开始按钮生成随机数组 btnGo.onclick =function(){ //清除 clearInterval(timer); timer = setInterval(function() { text.value = start(1,33,7); },50) } //单击停止按钮获取一组随机数 btnStop.onclick =function(){ clearInterval(timer); } </script></body></html> 2.复杂版
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Math.random方法彩票随机数的生成-升级版</title> <style type="text/css"> *{ margin: 0; padding: 0; } .wrap{ width: 600px; height: 300px; background-color: #f8e2e2; margin: 0 auto; } .list{ width: 440px; /*border: 1px solid red;*/ margin: 0px auto; } .list li{ list-style: none; width: 30px; height: 30px; display: inline-block; border: 1px solid #fff; border-radius: 30px; line-height: 30px; text-align: center; margin: 15px auto 15px; /*background-color: #f8f8f8;*/ /*background-color: rgba(255,255,255,1);*/ } .wrap p{ text-align: center; } .wrap p button{ text-align: center; width: 100px; } #setBtn{ background-color: red; color: #fff; border: none; } .active{ background-color: red; color: #fff; } </style></head><body> <div class="wrap" id="wrap"> <ul class="list"> <li>01</li> <li>02</li> <li>03</li> <li>04</li> <li>05</li> <li>06</li> <li>07</li> <li>08</li> <li>09</li> <li>10</li> <li>11</li> <li>12</li> <li>13</li> <li>14</li> <li>15</li> <li>16</li> <li>17</li> <li>18</li> <li>19</li> <li>20</li> <li>21</li> <li>22</li> <li>23</li> <li>24</li> <li>25</li> <li>26</li> <li>27</li> <li>28</li> <li>29</li> <li>30</li> <li>31</li> <li>32</li> <li>33</li> </ul> <p> <button id="setBtn">随机红球</button> <button id="clearBtn">清空</button> </p> </div> <script type="text/javascript"> var ballList = document.getElementById("wrap").getElementsByTagName("li"); var setBtn =document.getElementById("setBtn"); var clearBtn =document.getElementById("clearBtn"); //定义随机数组 function rnd(min, max) { return parseInt(Math.random()*(max - min + 1) + min); } function rndArray(min, max, length) { //先定义一个空数组 var arr = []; //生成一个长度为7的数组 while(arr.length < length) { //生成一个随机数 var rand = rnd(min, max); //判断生成的随机数rand是否在数组arr里,果然不在，就将这个随机数插入到数组里，如果在，执行下一次循环 if(arr.indexOf(rand) == -1) { arr.push(rand); } } arr.sort(function(a, b){return a - b;}) return arr; } function selectBall() { for(var j = 0; j < ballList.length; j++) { ballList[j].className = ""; } var arr = rndArray(1,33,7); // console.log(arr); for(var i = 0; i < arr.length; i++) { ballList[arr[i]-1].className = "active"; } } var timer = 0; setBtn.onclick = function() { clearTimeout(timer); timer = setInterval(selectBall,100); setTimeout(function() { clearTimeout(timer); },3000) // clearTimeout(timer); } clearBtn.onclick = function() { clearTimeout(timer); for(var j = 0; j < ballList.length; j++) { ballList[j].className = ""; } } </script></body></html>
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：FeHelper中新增【页面取色】工具_html/css_WEB-ITnoseNext article：兼容IE6浏览器的最大高度和最小高度css代码_html/css_WEB-ITnose