双色球演示

运用知识点有：随机数Math.random();数组元素删除splice（）；创建元素createElement（）；数组添加push();元素渲染到dom append（）等

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>双色球</title>
  </head>
  <style>
    .box {
      display: grid;
      grid-template-columns: repeat(auto-fill, 30px);
      grid-auto-rows: 30px;
      gap: 0.05rem;
    }
    .box > div {
      border-radius: 50%;
      background-color: red;
      display: grid;
      place-items: center;
      color: white;
      box-shadow: 2px 2px 2px #666;
    }
    .box > div:last-of-type {
      background-color: blue;
    }
  </style>
  <body>
    <div class="box"></div>
  </body>
  <script>
    //1生成32个数字临时数组
    let redNub = []; //临时数组
    let doubleBall = []; //中间数组
    for (let i = 0; i < 33; i++) {
      redNub.push(i);
    }
    console.log(redNub);
    //2、随机挑选6个数字放入数组,用随机数来做数组索引
    // 随机数：Math.random()
    console.log(Math.random());
    // 随机数乘以33向下取整
    console.log(Math.floor(Math.random() * redNub.length));
    // 遍历临时数组
    for (let i = 0; i <= 6; i++) {
      let index = Math.floor(Math.random() * redNub.length);
      doubleBall.push(redNub[index]);
      // 去重 索引不能重复
      redNub.splice(index, 1);
    }
    // 排序
    doubleBall.sort((a, b) => a - b);
    console.log(doubleBall);
    //3、生成16个数字
    let blue = Math.floor(Math.random() * 16) + 1;
    console.log(blue);
    doubleBall.push(blue);
    console.log(doubleBall);
    //4、数组渲染到dom
    const box = document.querySelector(".box");
    doubleBall.forEach(function (item) {
      const ball = document.createElement("div");
      ball.textContent = item;
      // console.log(ball);
      // box.append(ball);
      box.append(ball);
    });
  </script>
</html>

展示结果

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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双色球演示

运用知识点有：随机数Math.random();数组元素删除splice（）；创建元素createElement（）；数组添加push();元素渲染到dom append（）等