【每日一练】249—JS实现打字效果

每日一练7个月前发布 admin
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第249练的最终效果如下:

【每日一练】249—JS实现打字效果

 

HTML:

<!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=”index.css” />
    <title>第249练</title>
  </head>
  <body>
    <h1 id=”text”>Starting…</h1>
    <div>
      <label for=”speed”>速度:</label>
      <input type=”number” name=”speed” id=”speed” value=”1″ min=”1″ max=”10″ step=”1″>
    </div>
    <script src=”index.js”></script>
  </body>
</html>

CSS:

@import url(‘https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap’);
* {
  box-sizing: border-box;
}
body {
  background-color: #00A6BC;
  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: #fff;
  border: none;
  text-align: center;
}
input:focus {
  outline: none;
}

JS:

const textEl = document.getElementById(‘text’)
const speedEl = document.getElementById(‘speed’)
const text = ‘欢迎来到【web前端开发】公号平台,网站:www.webqdkf.com’
let idx = 1
let speed = 300 / speedEl.value
writeText()
function writeText() {
    textEl.innerText = text.slice(0, idx)
    idx++
    if(idx > text.length) {
        idx = 1
    }
    setTimeout(writeText, speed)
}
speedEl.addEventListener(‘input’, (e) => speed = 300 / e.target.value)
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