DAY2-09-HTML5-web存储_localStorage

数据存在硬盘，浏览器关闭数据不丢失，手动清除clear()，存储容量20M.不同浏览器不能共享数据。

<script type="text/javascript">
if (localStorage.pagecount)
  {
  localStorage.pagecount=Number(localStorage.pagecount) +1;
  }
else
  {
  localStorage.pagecount=1;
  }
document.write("Visits "+ localStorage.pagecount + " time(s).");
</script>