MediaWiki:Common.js：修订间差异

2025年4月14日 (一) 14:22的版本

(function(){
    if (!document.getElementById('snow-style')) {
        const style = document.createElement('style');
        style.id = 'snow-style';
        style.textContent = `
            @keyframes snowFall {
                0% { transform: translate(-50vw, -100px) rotate(0deg); }
                100% { transform: translate(50vw, 100vh) rotate(720deg); }
            }
            .snowflake {
                position: fixed;
                top: -10px;
                z-index: 9999;
                pointer-events: none;
                user-select: none;
                animation-timing-function: linear;
            }
        `;
        document.head.appendChild(style);
    }

    
    function createSnowflake() {
        const snowflake = document.createElement('div');
        snowflake.className = 'snowflake';
        snowflake.innerHTML = '🍀';
        const size = Math.random() * 16 + 8; // 
        const left = Math.random() * 100;
        const duration = Math.random() * 5 + 5; 
        const delay = Math.random() * 2;
        snowflake.style.cssText = `
            font-size: ${size}px;
            left: ${left}%;
            animation: snowFall ${duration}s ${delay}s linear 1;
            opacity: ${Math.random() * 0.5 + 0.5};
            color: hsl(${Math.random() * 360}, 100%, 90%);
        `;

       
        snowflake.addEventListener('animationend', function() {
            snowflake.remove();
        });

        document.body.appendChild(snowflake);
    }

    
    let interval = setInterval(createSnowflake, 500);

    
    document.addEventListener('visibilitychange', function() {
        if (document.hidden) {
            clearInterval(interval);
        } else {
            interval = setInterval(createSnowflake, 500);
        }
    });

    
    for (let i = 0; i < 10; i++) {
        createSnowflake();
    }
})();