计算器恶搞

// 问题演示
console.log(0.1 + 0.2); // 输出：0.30000000000000004
// 原理解析
// IEEE 754双精度浮点数无法精确表示0.1和0.2
// 0.1的二进制近似值：0.0001100110011001100110011001100110011001100110011001101
// 0.2的二进制近似值：0.001100110011001100110011001100110011001100110011001101
// 相加后舍入误差累积 → 0.30000000000000004

// 核心逻辑：利用视觉暂留与预测机制
function createIllusion() {
  const canvas = document.getElementById('calcCanvas');
  const ctx = canvas.getContext('2d');
  let current = '123456789';
  // 模拟屏幕刷新延迟
  setTimeout(() => {
    ctx.clearRect(0,0,canvas.width,canvas.height);
    ctx.font = '48px monospace';
    ctx.fillStyle = '#3d352b';
    // 动画过渡：先淡出旧数字，再淡入新数字
    for(let i=0; i<10; i++) {
      setTimeout(() => {
        const opacity = i/10;
        ctx.globalAlpha = opacity;
        ctx.fillText(current, 50, 100);
      }, i*50);
    }
    // 200ms后显示新数字（关键错觉点）
    setTimeout(() => {
      ctx.globalAlpha = 1;
      ctx.fillText('987654321', 50, 100);
    }, 200);
  }, 0);
}

# 需管理员权限
import sqlite3
import os
def extract_history():
    # Windows 10/11历史记录存储路径
    history_path = os.path.expandvars(
        r"%LOCALAPPDATA%\Packages\Microsoft.WindowsCalculator_8wekyb3d8bbwe\AC\Microsoft\WindowsCalculator\History.db"
    )
    if not os.path.exists(history_path):
        return "未找到历史记录文件"
    conn = sqlite3.connect(history_path)
    cursor = conn.cursor()
    # 查询最新10条记录
    cursor.execute("""
        SELECT expression, result, timestamp
        FROM History
        ORDER BY timestamp DESC
        LIMIT 10
    """)
    results = []
    for row in cursor.fetchall():
        results.append({
            "expression": row[0],
            "result": row[1],
            "time": row[2]
        })
    conn.close()
    return results
# 示例输出
print(extract_history())
# 输出示例：
# [{'expression': '123+456', 'result': '579', 'time': '2023-10-05 14:23:18'}, ...]