auto text effect

曾光誉

2023-12-01

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Auto Text Effect</title>
  </head>
  <body>
    <h1 id="text">Starting...</h1>

    <div>
      <label for="speed">Speed:</label>
      <input type="number" name="speed" id="speed" value="1" min="1" max="10" step="1">
    </div>

    <script src="script.js"></script>
  </body>
</html>

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

* {
  box-sizing: border-box;
}

body {
  background-color: darksalmon;
  font-family: 'Roboto', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

div {
  position: absolute;
  bottom: 20px;
  background: rgba(0, 0, 0, 0.1);
  padding: 10px 20px;
  font-size: 18px;
}

input {
  width: 50px;
  padding: 5px;
  font-size: 18px;
  background-color: darksalmon;
  border: none;
  text-align: center;
}

input:focus {
  outline: none;
}

const textEl = document.getElementById('text')
const speedEl = document.getElementById('speed')
const text = 'We Love Programming!'
// idx必需是全局变量
let idx = 1
// speed是指循环运动周期，而不是速率
let speed = 300 / speedEl.value

writeText()

function writeText() {
  // slice() 方法提取某个字符串的一部分，并返回一个新的字符串，且不会改动原字符串
    textEl.innerText = text.slice(0, idx)

    idx++

    if(idx > text.length) {
        idx = 1
    }

    // setTimeout()方法设置一个定时器，该定时器在定时器到期后执行一个函数或指定的一段代码
    setTimeout(writeText, speed)
}


speedEl.addEventListener('input', (e) => speed = 300 / e.target.value)

auto text effect

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