[JS]sessionStorage、localStorage与

先说怎么用，用在哪儿。

localStorage

1. 设置

   • localStorage.setItem(key,value)
   • localStorage.name = "kane"

2. 删除

   • localStorage.clear() 删除所有
   • localStorage.removeItem("name")删除指定

3. 查询

   • localStorage.getItem(key)
   • localStorage[key]
   • localStorage.valueOf() 查询所有
   • localStorage.hasOwnProperty(key)是否包含
   • localStorage.key(num=0) 查询index,默认查询第一个key