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Double color ball function code sharing implemented by JS

小云云Original: 2018-02-05 10:09:303874browse

This article mainly introduces the double-color ball function implemented by native JS, involving javascript random number generation and numerical operation related operation skills. Friends in need can refer to it, I hope it can help everyone.

Let’s take a look at the running effect first:

The specific code is as follows:

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>www.jb51.net - JS双色球</title>
  <style>
    #datePicker {
      width: 100px;
      height: 30px;
      line-height: 30px;;
      border-radius: 10px;
      border: 1px solid #5098a5;
      text-align: center;
      cursor: pointer;
    }
    #number {
      height: 100px;
      float: left;
      margin-top: 20px;
    }
    #number span {
      display: block;
      width: 30px;
      height: 30px;
      line-height: 30px;
      text-align: center;
      border-radius: 30px;
      border: 2px solid red;
      color: red;
      font-weight: bold;
      float: left;
      margin-top: 15px;
      margin-right: 10px;
    }
    #buleBall {
      height: 100px;
      margin-top: 21px;
      float: left;
    }
    #buleBall span {
      display: block;
      width: 30px;
      height: 30px;
      line-height: 30px;
      text-align: center;
      border-radius: 30px;
      background-color: blue;
      color: white;
      font-weight: bold;
      float: left;
      margin-top: 15px;
      margin-right: 10px;
    }
  </style>
</head>
<body>
<p class="container">
  <p style="overflow:hidden;">
    <p id="number"></p>
    <p id="buleBall"></p>
  </p>
  <p id="datePicker">点击按钮</p>
</p>
<script>
  //循环产生1-36数字
  var arr = [];
  function num() {
    for (var i = 1; i < 34; i++) {
      arr.push(i);
    }
    confusion();
  }
  var arrty= new Array(arr);
  //伪随机方法
  function confusion(){
    for(var i=1;i<34;i++){
      arrty[i]=i;
    }
    arrty.sort(function(){ return 0.5 - Math.random() });
//    var str=arrty.join();
    arrAy()
  }
  // 将随机获取的数据添加到页面上去
  function arrAy() {
    var array = getRandomArrayElements(arrty, 6);
    array.sort(function (a, b) {//数组排序
      return a > b ? 1 : -1;
    });
    var htm = "";
    for (var i = 0; i < array.length; i++) {
      htm += &#39;<span>&#39; + array[i] + &#39;</span>&#39;;
    }
    document.getElementById(&#39;number&#39;).innerHTML = htm;
  }
  // 从1-36中随机取出其中6个参数
  function getRandomArrayElements(arr, count) {
    var shuffled = arr.slice(0), i = arr.length, min = i - count, temp, index;
    while (i-- > min) {
      index = Math.floor((i + 1) * Math.random());
      temp = shuffled[index];
      shuffled[index] = shuffled[i];
      shuffled[i] = temp;
    }
    return shuffled.slice(min);
  }
  //随机获取一个蓝球的方法
  function blueBall() {
    var html = "";
    var array = [];
    for (var k = 1; k < 17; k++) {
      array.push(k);
    }
    //随机生成蓝色球的算法
    var n = Math.floor(Math.random() * array.length);
    if (n != "0") {//去除获取到的篮球数为0的
      html += &#39;<span>&#39; + n + &#39;</span>&#39;;
    }
    document.getElementById(&#39;buleBall&#39;).innerHTML = html;
  }
  window.onload = function () {
    var datePicker = document.getElementById("datePicker");
    datePicker.onclick = function () {
      num();//点击按钮生成1-33的数字方法
      blueBall();//点击后获取随机蓝球的方法
    };
  }
</script>
</body>
</html>

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