🍽️ 今天吃点啥

基于杭州市区真实餐厅数据，一键随机推荐，收藏你爱的那一口

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🍳 专为杭州吃货打造，前端离线随机小工具 · 数据来自杭州市区真实餐厅

// ===== 今天吃点啥 - 核心逻辑 =====
// 1. 加权随机算法
function weightedRandom(items) {
  const totalWeight = items.reduce((sum, it) => sum + it.weight, 0);
  let rand = Math.random() * totalWeight;
  for (const item of items) {
    rand -= item.weight;
    if (rand <= 0) return item;
  }
  return items[items.length - 1];
}

// 2. 多条件筛选
function filterFoods(foods, filters) {
  return foods.filter(f => {
    if (filters.types.length && !filters.types.includes(f.type)) return false;
    return true;
  });
}

// 3. LocalStorage 持久化
function saveFavorites(list) {
  localStorage.setItem('eat_favorites', JSON.stringify(list));
}
function loadFavorites() {
  return JSON.parse(localStorage.getItem('eat_favorites') || '[]');
}

// 4. Canvas 食物线条动画
function initCanvas() {
  const canvas = document.getElementById('eat-bg-canvas');
  if (!canvas) return;
  const ctx = canvas.getContext('2d');
  let foods = ['🍜','🍕','🍔','🥘','🍱','🍣','🍩','🍪'];
  let particles = foods.map((emoji, i) => ({
    x: Math.random() * canvas.width, y: Math.random() * canvas.height,
    vx: (Math.random() - 0.5) * 0.8, vy: -0.3 - Math.random() * 0.5,
    emoji, size: 20 + Math.random() * 16
  }));
  function loop() { /* requestAnimationFrame 驱动粒子漂浮 */ }
}