永久本地储存

 <script type="text/javascript">
 2     //添加key-value 数据到 sessionStorage
 3     localStorage.setItem("name", "怜白");
 4     localStorage.setItem("job", "前端");
 5 
 6     //通过key来获取value
 7     var name = localStorage.getItem("name");
 8 
 9     console.log(name); // 怜白
10     console.log(localStorage.length); // 2
11 
12     // 通过key删除value
13     localStorage.removeItem("job");
14 
15     console.log(localStorage.length); // 1
16 
17     //清空所有的key-value数据。
18     localStorage.clear();
19 
20     console.log(localStorage.length); // 0
21 </script>