js如何获取span标签的值

<span id="mySpan">Hello World</span>

<script>
  var spanValue = document.getElementById('mySpan').innerText;
  console.log(spanValue); // 输出: Hello World
</script>

<span class="myClass">Hello World</span>

<script>
  var spanValue = document.querySelector('.myClass').innerText;
  console.log(spanValue); // 输出: Hello World
</script>

<span>First Span</span>
<span>Second Span</span>

<script>
  var spans = document.getElementsByTagName('span');
  for (var i = 0; i < spans.length; i++) {
    console.log(spans[i].innerText);
  }
  // 输出:
  // First Span
  // Second Span
</script>

<span class="myClass">Value 1</span>
<span class="myClass">Value 2</span>

<script>
  var spans = document.getElementsByClassName('myClass');
  for (var i = 0; i < spans.length; i++) {
    console.log(spans[i].innerText);
  }
  // 输出:
  // Value 1
  // Value 2
</script>

window.onload = function() {
  var spanValue = document.getElementById('mySpan').innerText;
  console.log(spanValue);
};