网页加载速度测试

测试网页加载速度
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// ==UserScript==
// @name        网页加载速度测试
// @author      DeepSeek
// @version     3.1.5
// @description 测试网页加载速度
// @match       *://*/*
// @run-at      document-start
// @grant       none
// @namespace   https://gf.qytechs.cn/users/452911
// ==/UserScript==

(function() {
  // 创建显示元素
  const loadTimeElement = document.createElement('div');
  
  // 白色背景黑色文字的简洁样式，固定在底部居中
  loadTimeElement.style.cssText = `
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.98);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
    color: #222;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 15px;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    z-index: 999999;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    max-width: 90vw;
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
  `;

  // 添加动画效果
  const style = document.createElement('style');
  style.textContent = `
    @keyframes fadeInScale {
      0% { opacity: 0; transform: translateX(-50%) scale(0.95); }
      100% { opacity: 1; transform: translateX(-50%) scale(1); }
    }
    @keyframes fadeOutScale {
      0% { opacity: 1; transform: translateX(-50%) scale(1); }
      100% { opacity: 0; transform: translateX(-50%) scale(0.95); }
    }
  `;
  document.head.appendChild(style);

  const startTime = performance.now();

  window.addEventListener('load', () => {
    const endTime = performance.now();
    const timeElapsed = endTime - startTime;
    
    loadTimeElement.textContent = `页面加载耗时: ${timeElapsed.toFixed(2)} ms`;
    
    // 添加淡入动画
    loadTimeElement.style.animation = 'fadeInScale 0.25s cubic-bezier(0.2, 0, 0, 1.2) forwards';
    
    document.body.appendChild(loadTimeElement);
    
    // 淡出消失
    setTimeout(() => {
      loadTimeElement.style.animation = 'fadeOutScale 0.25s ease forwards';
      setTimeout(() => {
        loadTimeElement.remove();
      }, 100);
    }, 1500);
  });
})();
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