console 命令行工具 X clear
console
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>电池电量</title>
    <style>
        #battery {
            font-size: 24px;
            margin-bottom: 20px;
        }
        #messages {
            height: 100px;
            overflow-y: auto;
            border: 1px solid #ccc;
            padding: 10px;
        }
    </style>
</head>
<body>
    <div id="battery">电池电量: 100%</div>
    <button onclick="decreaseBattery()">减少电量</button>
    <div id="messages"></div>

    <script>
        let batteryLevel = 100;
        const messagesDiv = document.getElementById('messages');

        function decreaseBattery() {
            if (batteryLevel > 0) {
                batteryLevel -= 1;
                document.getElementById('battery').innerText = `电池电量: ${batteryLevel}%`;
                addMessage(`电池电量减少到 ${batteryLevel}%`);
            } else {
                addMessage("电池电量已经为 0%");
            }
        }

        function addMessage(message) {
            const messageElement = document.createElement('div');
            messageElement.innerText = message;
            messagesDiv.appendChild(messageElement);
            messagesDiv.scrollTop = messagesDiv.scrollHeight; // 自动滚动到底部
        }
    </script>
</body>
</html>