Home >Web Front-end >JS Tutorial >js implements lottery system function code sharing

js implements lottery system function code sharing

小云云Original: 2018-02-08 13:15:262844browse

This article mainly introduces in detail the functions of the js lottery system on a topic about the lottery system. It has a certain reference value. Interested friends can refer to it. I hope it can help you develop a lottery system using js.

Required functions:

1. Click the left button to start the lottery, click the right button to stop the lottery;

2. Hit the Enter key to start the lottery , hit the Enter key again to stop the lottery;

3. After starting the lottery, the button on the left changes color;

html：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>抽奖</title>
  <link rel="stylesheet" href="style.css">
  <script src="eventUtil.js"></script>
  <script src="js.js"></script>
</head>
<body>
<p class="box">
  <p id="header">开始抽奖啦！</p>
  <p id="btn">
    <span id="start">开始</span>
    <span id="stop">结束</span>
  </p>
</p>
</body>
</html>

css:

body{
  margin: 0;
  padding: 0;
}
.box{
  width: 400px;
  height: 200px;
  border: 1px solid #0C4E7C;
  margin: 0 auto;
}
#header{
  color:darkred;
  font-size: 24px;
  text-align: center;
  width: 400px;
  height: 60px;
  line-height: 60px;
}
#btn{
  width: 200px;
  overflow: hidden;
  margin: 30px auto 0;
}
#btn span{
  cursor: pointer;
  border: 2px solid #a09a09;
  border-radius: 7px;
  margin-right: 10px;
  color: #000;
  display: inline-block;
  height: 40px;
  width: 80px;
  background-color: #f2ec55;
  line-height: 40px;
  text-align: center;
}

JavaScript:

js.js:
var date = ["谢谢参与", "谢谢参与", "谢谢参与", "50元话费", "ipad", "佳能相机", "苹果手机", "3DS", "switch", "1000元超市购物卡"];
var timer = null;
var flag = 0;


window.onload = function () {

  // var header = document.getElementById("header");优化前
  var start = document.getElementById("start");
  var stop = document.getElementById("stop");
//鼠标抽奖
  eventUtil.addHandler(start, "click", getStart);
  eventUtil.addHandler(stop, "click", getStop);
//键盘抽奖；
  document.onkeyup = function (event) {
    var e = event || window.event;
    //检测按键键值；
    // console.log(e.keyCode);
    if (e.keyCode === 13) {
      if (flag === 0) {
        getStart();
        flag = 1;
      } else {
        getStop();
        flag = 0;
      }
    }
  };

  function getStart() {
    clearInterval(timer);
    var header = document.getElementById("header");//优化后
    timer = setInterval(function () {
      //代码优化前
      //var x = parseInt(Math.random()*10);
      var random = Math.floor(Math.random() * date.length);
      header.innerHTML = date[random];
    }, 50);
    start.style.backgroundColor = "#999";
    flag = 1;
  }

  function getStop() {
    clearInterval(timer);
    start.style.backgroundColor = "#f2ec55";
    flag = 0;
  }
};

eventUtil.js

var eventUtil = {
  getEvent:function (event) {
    return event?event:window.event;
  },
  getType: function (event) {
    return event.type;
  },
  getTarget:function (event) {
    return event.target||event.srcElement;
  },
  //阻止冒泡
  stopPropagation:function (event) {
    if(event.stopPropagation){
      event.stopPropagation();
    }else {
      event.cancelBubble=true;
    }
  },
  //阻止事件默认行为；
  preventDefault:function(event){
    if(event.preventDefault){
      event.preventDefault();
    }else {
      event.returnValue = false;
    }
  },
  //添加具柄；
  addHandler: function (element, type, Handler) {
    if (element.ç) {
      element.addEventListener(type, Handler, false);
    } else if (element.attachEvent) {
      element.attachEvent("on" + type, Handler);
    } else {
      element["on" + type] = Handler;
    }
  },
  //删除具柄；
  removeHandler: function (element, type, Handler) {
    if (element.removeEventListener) {
      element.removeEventListener(type, Handler, false);
    } else if (element.detachEvent) {
      element.detachEvent("on" + type, Handler);
    } else {
      element["on" + type] = null;
    }
  }
};

Related recommendations:

php implementation of lottery probability algorithm code

JavaScript implementation of lottery system example sharing

JQuery implements simple lottery game technology sharing

The above is the detailed content of js implements lottery system function code sharing. For more information, please follow other related articles on the PHP Chinese website!

php JavaScript jquery css html JS 算法

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：How to implement simple date formatting function with jQueryNext article：How to implement simple date formatting function with jQuery

See more

js implements lottery system function code sharing

Related articles