原生实现随机点名

原生实现随机点名

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #name_box li {
    
    
      margin: 10px;
      padding: 10px;
      border: 1px solid white;
      border-radius: 10px;
    }

    .active {
    
    
      background-color: white;
      color: black;
      /* 2D转换的属性名 */
      transform: scale(1.3);
      /* 过渡效果的属性名 */
      transition: transform 0.3s;
      /* 位移,属于transform的属性值 */
      /* translate */
    }
  </style>
</head>

<body style="background-color: black; color: white;">

  <div style="display: flex; flex-flow: column; align-items: center;">
    <div>总人数:<span id="total">?</span> 人,抽取: <input type="text" id="size"></div>
    <div>
      <button id="btn" type="button" style="height: 50px; font-size: 20px; margin-top: 10px;">点击随机抽取 ?</button>
    </div>
    <div>
      <ul id="name_box" style="list-style: none; margin: 0; padding: 0; display: flex; flex-flow: row wrap;">
      </ul>
    </div>
  </div>

  <script>

    (() => {
    
    

      const btn = document.querySelector('#btn')
      const name_box = document.querySelector('#name_box')
      const sizeInput = document.querySelector('#size')
      const total = document.querySelector('#total')

      console.log();

      let size = sizeInput.value ? parseInt(sizeInput.value) : 1;

      btn.innerHTML = `点击随机抽取 ${
      
      size} 位`

      const students = [
      '张三',
            '李四',
            '王五',
            '阿福',
            '旺财',
            '小米',
            '小红',
            '白白',
            '小天',
            '赵六',
            '晓晴',
            '吴浩',
            '阿勇',
            '王武',
            '江山',
            '天下',
            '阮天',
            '萌萌',
            '芒果',
            '卿苑',
            '青柠',
            '青鸢',
            '苹芃',
            '小妮',
            '子依',
            '点点',
            '贤贤',
            '软甜',
            '温柔',
            '御姐',
            '萝莉',
            '嘻嘻',
            '瞅瞅',
            '精灵',
            '鲁班',
            '小智',
            '月月',
            '软软',
            '冉冉',
            '小琪',
            '佳瑞',
            '丫头',
            
      ]


    //   const studentIndexs = students.map((v, i) => i)
      const studentIndexs = students.map(  function(elm,i) {
    
    
          return i;
      });

      total.innerHTML = students.length;

      students.sort(() => 0.5 - Math.random());
  

      students.forEach(v => {
    
    
        const li = document.createElement('li')
        li.innerHTML = v
        name_box.appendChild(li)
      })


      let intervalId = null;
    
      btn.addEventListener('click', () => {
    
    
        // console.log(students.map((v, i) => i)) // .sort(() => 0.5 - Math.random())
        // console.log(students.map((v, i) => i).sort(() => 0.5 - Math.random()))
        // 已开启,就停止
        let yi = [...name_box.children]; // 这里作用:数组解构:  1. 将伪数组转换为真数组  2.把 [] 去除,将拓展运算符数组中的每一个数据项都拿出来,单独作为一个数据项
        console.log(yi)
        if (intervalId) {
    
    
          btn.innerHTML = `点击随机抽取 ${
      
      size} 位`
          clearInterval(intervalId)
          intervalId = null
        }
        // 未开启,就开启 , 此时是还没有开启的状态, 点击后立马开启
        else {
    
    
          btn.innerHTML = '确定选择'
          intervalId = setInterval(() => {
    
    
           yi.forEach(li => {
    
    
              li.classList.remove('active')
            })
            const selectStudentIndexs = studentIndexs.sort(() => 0.5 - Math.random()).slice(0, size)
            selectStudentIndexs.forEach(v => {
    
    
              name_box.children[v].classList.add('active')
            })
          }, 20);
        }
      })


      sizeInput.addEventListener('blur', (e) => {
    
    
        // console.log(e.target.value)
        size = parseInt(e.target.value)
        btn.innerHTML = `点击随机抽取 ${
      
      size} 位`
      })

    })();

  </script>
</body>

</html>

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转载自blog.csdn.net/weixin_47988564/article/details/107134318