today_ai_weather/app/javascript/controllers/page_load_time_controller.js

import {Controller} from "@hotwired/stimulus"

export default class extends Controller {
    static targets = ["timer"]

    connect() {
        // 记录页面加载开始的时间
        const startTime = performance.now();

        // 监听页面加载完成事件
        window.addEventListener('load', () => {
            const endTime = performance.now();
            const loadTime = endTime - startTime;
            // 更新显示
            this.timerTarget.textContent = Math.ceil( loadTime );
        });
    }
}