gk.js

// 选择启用动态取色功能或自动颜色调整
const useDynamicColor = true; // 若不需要动态取色，改为 false
const useLocalTime = false; // 若要使用本地时间，改为 true；否则使用服务器时间

function fetchServerTime() {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', 'https://worldtimeapi.org/api/timezone/Asia/Shanghai', true);
  xhr.onload = function() {
    if (xhr.status >= 200 && xhr.status < 300) {
      var response = JSON.parse(xhr.responseText);
      var serverTime = new Date(response.utc_datetime);
      updateCountdown(serverTime);
    } else {
      console.error('Error fetching server time:', xhr.status);
    }
  };
  xhr.send();
}

function padZero(num) {
  return num < 10 ? '0' + num : num;
}

function updateCountdown(time) {
  var today = time || new Date();
  var currentYear = today.getFullYear();
  var examDateStart = new Date(currentYear, 5, 7); // 6月7日，月份从0开始计数
  var examDateEnd = new Date(currentYear, 5, 9, 18, 0, 0); // 6月9日 18:00
  var nextYearExamDate = new Date(currentYear + 1, 5, 7); // 下一年的高考日期

  if (today >= examDateStart && today <= examDateEnd) {
    document.getElementById("countdown").style.display = "none";
    document.getElementById("greeting").style.display = "block";
    document.getElementById("greeting").innerText = "今年的高考进行中，祝考试的同学们旗开得胜，金榜题名！";
  } else {
    document.getElementById("greeting").style.display = "none";
    document.getElementById("countdown").style.display = "block";
    var timeDiff = examDateStart - today;
    if (today > examDateEnd) {
      timeDiff = nextYearExamDate - today;
      currentYear++;
    }
    var days = Math.floor(timeDiff / (1000 * 60 * 60 * 24));
    var hours = padZero(Math.floor((timeDiff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)));
    var minutes = padZero(Math.floor((timeDiff % (1000 * 60 * 60)) / (1000 * 60)));
    var seconds = padZero(Math.floor((timeDiff % (1000 * 60)) / 1000));

    document.getElementById("days").innerText = days;
    document.getElementById("hours").innerText = hours;
    document.getElementById("minutes").innerText = minutes;
    document.getElementById("seconds").innerText = seconds;
    document.getElementById("year").innerText = currentYear;
  }
}

function fetchHitokoto() {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', 'https://v1.hitokoto.cn/', true);
  xhr.onload = function() {
    if (xhr.status >= 200 && xhr.status < 300) {
      var response = JSON.parse(xhr.responseText);
      document.getElementById("hitokoto").innerText = response.hitokoto + " -- " + response.from;
    } else {
      console.error('Error fetching hitokoto:', xhr.status);
    }
  };
  xhr.send();
}

function setAutoColor() {
  const elements = document.querySelectorAll('.auto-color');
  elements.forEach(el => {
    const rgb = getAverageRGB(document.body);
    const yiq = ((rgb.r*299)+(rgb.g*587)+(rgb.b*114))/1000;
    el.style.color = (yiq >= 128) ? 'black' : 'white';
  });
}

function getAverageRGB(imgEl) {
  var blockSize = 5, // 取样间隔
      defaultRGB = {r:255,g:255,b:255}, // 默认白色
      canvas = document.createElement('canvas'),
      context = canvas.getContext && canvas.getContext('2d'),
      data, width, height,
      i = -4,
      length,
      rgb = {r:0,g:0,b:0},
      count = 0;

  if (!context) {
    return defaultRGB;
  }

  height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height;
  width = canvas.width = imgEl.naturalWidth || imgEl.offsetWidth || imgEl.width;

  context.drawImage(imgEl, 0, 0);

  try {
    data = context.getImageData(0, 0, width, height);
  } catch(e) {
    return defaultRGB;
  }

  length = data.data.length;

  while ( (i += blockSize * 4) < length ) {
    ++count;
    rgb.r += data.data[i];
    rgb.g += data.data[i+1];
    rgb.b += data.data[i+2];
  }

  rgb.r = ~~(rgb.r/count);
  rgb.g = ~~(rgb.g/count);
  rgb.b = ~~(rgb.b/count);

  return rgb;
}

function initCountdown() {
  if (useLocalTime) {
    updateCountdown(new Date());
    setInterval(() => updateCountdown(new Date()), 1000);
  } else {
    fetchServerTime();
    setInterval(fetchServerTime, 1000);
  }
}

document.addEventListener("DOMContentLoaded", () => {
  // 获取时间并更新倒计时
  initCountdown();
  
  // 获取一言
  fetchHitokoto();
  setInterval(fetchHitokoto, 3600000);

  // 动态设置字体颜色
  if (!useDynamicColor) {
    setAutoColor();
  }
});