console 命令行工具 X clear

console

const labels = document.querySelectorAll('.form-control label');

labels.forEach(label => {
    label.innerHTML=label.innerText.split('')
    .map((letter,idx)=>`<span style="transition-delay:${idx*50}ms">${letter}</span>`)
    .join('');
})

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Form Input Wave</title>
    <link rel="stylesheet" href="style.css" />
</head>
<body>
    <div class="container">
        <h1>Please Login</h1>
        <form>
            <div class="form-control">
                <input type="text" required>
                <label>
                    Email
                </label>
            </div>
            <div class="form-control">
                <input type="password" required>
                <label>Password</label>
            </div>
            <button class="btn">Login</button>
            <p class="text">Don't have an account? <a href="#">Register</a> </p>
        </form>
    </div>
    
    <script src="script.js"></script>
</body>
</html>

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-color: steelblue;
    color:white;
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container{
    background-color: rgb(0,0,0,0.4);
    padding: 20px 40px ;
    border-radius: 5px;
}

.container h1{
    text-align: center;
    margin-bottom: 30px;
}

.btn{
    cursor: pointer;
    width: 100%;
    background-color: lightblue;
    padding: 15px;
    border:0;
    font-size: 16px;
    font-family: inherit;
}

.btn:focus{
    outline:0;
}

.btn:active{
    transform: scale(0.98);
}

.container a{
    text-decoration: none;
    color:lightblue;
}

.text{
    margin-top: 30px;
}


.form-control{
    width: 300px;
    margin: 20px 0 40px;
    position: relative;
}

.form-control input{
    background-color: transparent;
    border:0;
    border-bottom:2px solid white;
    display: block;
    width: 100%;
    padding: 15px 0;
    font-size: 18px;
    color:white;
}

.form-control input:focus{
    outline: 0;
    border-bottom-color: lightblue;
}

.form-control input:valid{
    border-bottom-color: lightblue;
}

.form-control label{
    position: absolute;
    left:0;
    top:15px;
}

.form-control label span{
    display: inline-block;
    font-size: 18px;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}


.form-control input:focus + label span,
.form-control input:valid + label span
{
    transform: translateY(-30px);
    color:lightblue
}