javascript - 如何在javascript中增加页面加载范围内的值？

Question

例如，我想增加 javascript 中标签之间的值

<span class="quantity">1</span>

页面加载后会是这样

<span class="shopp-quantity">2</span>

Answer 1

这与昨天的大致相同：

<span class="quantity"></span>
<script>
   localStorage['myid'] =
      document.getElementsByClassName('quantity')[0].innerHTML =
          parseInt(localStorage['myid'] || '0') + 1;
</script>