如何使用Javascript解析博客Rss提要并在HTML页面上获得输出？

// 1. 获取Rss提要的URL
var rssUrl = "博客Rss提要的URL";

// 2. 发起HTTP请求
var xhr = new XMLHttpRequest();
xhr.open("GET", rssUrl, true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    // 3. 解析Rss提要
    var parser = new DOMParser();
    var xmlDoc = parser.parseFromString(xhr.responseText, "text/xml");

    // 4. 提取所需信息
    var items = xmlDoc.getElementsByTagName("item");
    var output = "";
    for (var i = 0; i < items.length; i++) {
      var title = items[i].getElementsByTagName("title")[0].textContent;
      var link = items[i].getElementsByTagName("link")[0].textContent;
      var description = items[i].getElementsByTagName("description")[0].textContent;
      
      // 5. 创建HTML元素
      var itemElement = document.createElement("div");
      var titleElement = document.createElement("h2");
      var linkElement = document.createElement("a");
      var descriptionElement = document.createElement("p");
      
      titleElement.textContent = title;
      linkElement.href = link;
      linkElement.textContent = "Read more";
      descriptionElement.textContent = description;
      
      itemElement.appendChild(titleElement);
      itemElement.appendChild(linkElement);
      itemElement.appendChild(descriptionElement);
      
      output += itemElement.outerHTML;
    }
    
    // 6. 渲染到页面
    document.getElementById("rssOutput").innerHTML = output;
  }
};
xhr.send();