Range: toString() 方法

toString()

<p>
  This example logs <em>everything</em> between the emphasized <em>words</em>.
  Look at the output below.
</p>
<p id="log"></p>

const range = document.createRange();

range.setStartBefore(document.getElementsByTagName("em").item(0), 0);
range.setEndAfter(document.getElementsByTagName("em").item(1), 0);
document.getElementById("log").textContent = range.toString();