test.js

if("// testing load speed", true) {

    "use strict";

    const load_cycles = 10;
    let time_s = 0;
    let execution = 0;
    let done = 0;
    const request_uri = "/zh/于斯納爾斯貝里市";
    // const request_uri = "/zh/2004年澳门华榕大厦纵火案";

    const next_trial = function() {

        const xhr = new XMLHttpRequest;
        let time_of_admission;
        xhr.open("GET", request_uri, true);
        xhr.onreadystatechange = () => {
            if(xhr.readyState === 4) {
                const time_consumed = Date.now() - time_of_admission;
                done += 1;
                time_s += time_consumed;
                console.log(`xhr #${done} is through. w\\ status ${xhr.status}`);
                if(done === load_cycles) {
                    console.log(`${done} trials have been carried out, average time_s is ${time_s / done}.`)
                } else {
                    next_trial();
                }
            }
        };
        time_of_admission = Date.now();
        execution += 1;
        console.log(`xhr #${execution} is initiated.`);
        xhr.send();
    };

    next_trial();
}