Javascript特效之输入框点击效果

"单击输入框，在上方会显示一行动态的文字提示。
![鼠标点击效果](http://www.agoodlife.cn/usr/uploads/2024/04/sbdj.gif ""鼠标点击效果"")
## 编写HTML代码如下：
```html
<!DOCTYPE html>
<html>
  <head>
    <meta charset=""UTF-8"" />
    <title>使用 CSS 和 Javascript 输入文本点击动画</title>
    <link rel=""stylesheet"" href=""style.css"" />
  </head>
  <body>
    <div class=""box"">
      <input type=""text"" required />
      <label>请输入您的名字</label>
    </div>
    <script src=""script.js""></script>
  </body>
</html>

```
## 编写CSS代码如下：
```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #29313a;
}

.box {
    position: relative;
    width: 350px;
}

.box input {
    position: relative;
    width: 100%;
    padding: 10px 0;
    background: transparent;
    border: none;
    outline: none;
    border-bottom: 2px solid #999;
    color: #fff;
    font-size: 1.25em;
    transition: 0.5s;
}

.box label {
    position: absolute;
    left: 0;
    padding: 10px 0;
    pointer-events: none;
    color: #666;
    user-select: none;
}

.box label span {
    display: inline-flex;
    font-size: 1.25em;
    letter-spacing: 0.05em;
    transition: 0.25s;
}

.box input:focus~label span,
.box input:valid~label span {
    color: #0f0;
    text-shadow: 0 0 5px #0f0,
    0 0 15px #0f0,
    0 0 30px #0f0;
    transform: translateY(-40px);
}

.box input:focus,
.box input:valid {
    border-bottom: 2px solid #fff;
}
```
## 编写Javascript代码如下：
```javascript
let label = document.querySelector(""label"");

label.innerHTML = label.innerText
  .split("""")
  .map(
    (words, i) => `<span style=""transition-delay:${i * 30}ms"">${words}</span>`
  )
  .join("""");
```"

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