<p id="paragraph1">这是段落1的文本。</p>
<p id="paragraph2">这是段落2的文本。</p>

var radioButton = document.getElementById("radioButton");
radioButton.addEventListener("change", function() {
  // 在这里编写根据单选按钮状态变化来更改文本的代码
});

var paragraph1 = document.getElementById("paragraph1");
var paragraph2 = document.getElementById("paragraph2");

radioButton.addEventListener("change", function() {
  if (radioButton.checked) {
    paragraph1.textContent = "段落1已选中";
    paragraph2.textContent = "段落2已选中";
  } else {
    paragraph1.textContent = "这是段落1的文本。";
    paragraph2.textContent = "这是段落2的文本。";
  }
});