监听键盘事件

ycxom2024年12月13日小于 1 分钟
监听键盘事件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f0f0f0;

        }

        input {
            width: 100%;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ddd;
            border-radius: 4px;
            margin-bottom: 10px;
        }

        .text-length {
            font-size: 14px;
            color: #666;
            margin-bottom: 10px;
        }

        .data-text-list {
            background-color: white;
            border-radius: 4px;
            padding: 10px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .data-text-list h5 {
            margin: 0;
            font-size: 18px;
            color: #333;
        }

        .data-text-list div {
            font-size: 12px;
            color: #999;
            margin-top: 5px;
            margin-bottom: 15px;
        }
    </style>
</head>
<body>
    <input placeholder="输入内容并回车">
    <div class="text-length"></div>
    <div class="data-text-list"></div>

    <script>
        const input = document.querySelector('input')
        const dataTextList = document.querySelector('.data-text-list')
        const textLength = document.querySelector('.text-length')

        // 使用 keyup 事件监听键盘事件（用户抬起按键）  keydown 事件（用户按下按键）
        input.addEventListener('keyup',function (e) {
            // console.log(e)
            // console.log(`当前键盘事件：${e.key}`)
            let userInput = input.value
            const length = input.value.trim().length
            const now = new Date
            const Time = now.toLocaleString()
            // console.log(Time)
            

            length > 0? textLength.innerHTML = `${length}字` : textLength.innerHTML = null
            // console.log(length)

            if(e.key !== 'Enter' || userInput.trim() === '') return;
                console.log('ok');
                dataTextList.innerHTML += `<h5>${userInput}</h5><div>${Time}<div>`;
                input.value = null;
                textLength.innerHTML = null

        })
    </script>

    <script>
        
    </script>
</body>
</html>