TL;DR=我需要显示ads数组中的一个随机对象

我有一个对象数组：

{
    "ads": [
        {
            "adLogo": "src/img/ads/ad1.png",
            "adCompany": "Ad Company 1",
            "adBackgroundColor": "#1e64f0",
            "adDescription": "Ad company 1 is awesome",
            "adLink": "ad_company1_link_goes_here"
        },
        {
            "adLogo": "src/img/ads/ad2.png",
            "adCompany": "Ad Company 2",
            "adBackgroundColor": "#1e64f0",
            "adDescription": "Ad company 2 is awesome",
            "adLink": "ad_compan21_link_goes_here"
        },
    ]
}

我有这样的代码来显示JSON中的一个值：

fetch("src/js/_ads.json")
          .then(function (response) {
            return response.json();
          })
          .then(function (data) {
            appendData(data);
          })
          .catch(function (err) {
            console.log('error: ' + err);
          });

        function appendData(data) {
          let mainContainer = document.getElementById("ad-block");
          for (let i = 0; i = Math.floor(Math.random() * data.length); i++) {
            let adLink = data[i].adLink;
            let adDesc = data[i].adDescription;
            let adLogo = data[i].adLogo;
            let adCompany = data[i].adCompany;
            let adBackground = data[i].adBackgroundColor;
            document.querySelector("#ad-block").innerHTML +=
              `
            <a href="${adLink}" target="_blank" id="ad-click">
              <div class="ad__banner ad__banner--dark ad__banner--column">
              <div class="ad__image" style="background-color: ${adBackground}">
                <img src="${adLogo}" alt="sponsored by ${adCompany}">
              </div>
              <div class="ad__desc">
                <div class="ad__tagline">${adDesc}</div>
                <div class="ad__button" style="background-color: var(--gray-700)">Start Free Trial</div>
                <div class="ad__sponsored"><strong style="color: ${adBackground}">${adCompany}</strong> Affiliate</div>
              </div>
              </div>
            </a>
                `;
          }
        }

我有一些代码来获取一个随机值Math.floor(Math.random() *，但它最终显示了所有的对象，而不是一个随机对象。