js实现双色球效果

时间:2020-08-02 Mr.王征人气:0

本文着重为大家仔细讲解了js实现双色球效果，文中代码实例讲解的非常细致，希望能够帮助到您，欢迎大家阅读和收藏

效果展示：

源码展示：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>js实现双色球效果</title>
  <style>
    span{
      font-size: 20px;
    }
    .a {
      color: red;
    }
 
    .b {
      color: blue;
    }
  </style>
</head>
<body>
<button>点击获取今日双色球数</button>
<pre>
  <span class="a"></span><span class="b"></span>
</pre>
 
 
<script>
  var arrS = [];
  for (let i = 1; i < 34; i++) {
    arrS[i - 1] = i;
  }
 
  var spans = document.querySelectorAll("span");
  document.querySelector("button").onclick = function () {
 
    /*es6 使用 set 集合会自动去除重复*/
    /*获取红球*/
    let set = new Set();
    while (set.size < 6) {
      set.add(getR(arrS, arrS.length));
    }
 
    /*获取篮球*/
    let set1 = new Set();
    while (set1.size < 1) {
      set1.add(getR(arrS, 16));
    }
    var hong = "";
    var lan = "";
    for (let v of set) {
      hong += v;
      hong += "  ";
    }
    for (let v of set1) {
      lan += v;
      lan += " ";
    }
 
    //将内容添加到页面上
    spans[0].innerText = hong;
    spans[1].innerText = lan;
  }
 
  // 获取指定范围内的随机数
  function getR(arr, al) {
    return arr[Math.floor(Math.random() * al)];
  }
</script>
</body>
</html>

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