如何在javascript中的頁面加載跨度中增加值？

Question

我想增加標籤之間的值在JavaScript 例如

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

頁面加載後，它會像這樣

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

Answer 1

這是差不多的比yesterday's：

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