postcss-mobile-forever/example/templates/kite-trip/demo.html at main · wswmsword/postcss-mobile-forever · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>

  <button class="btn">随机数</button>

  <script>
    // 1. 给定的数据
    const values = [200, 400, 600, 800, 1000]

    // 2. 监听按钮的点击
    const btnEl = document.querySelector(".btn")
    btnEl.onclick = () => {
      const currentValue = Math.floor(Math.random() * 1500)
      matchIndex(currentValue)
    }

    // 匹配对应的索引
    function matchIndex(currentValue) {
      let currentIndex = values.length - 1

      for (let i = 0; i < values.length; i++) {
        const value = values[i]
        if (value > currentValue) {
          currentIndex = i - 1
          break
        }
      }

      if (currentIndex === -1) return
      console.log("value:", currentValue, "index:", currentIndex)
    }

  </script>

</body>
</html>