本地存储之localStorage的使用

1. 对象的操作

        - localStorage.a = "hello";

        - localStorage.a = "world";

        - console.log(localStorage.a);

        - delete localStorage.a;

2.自身的API(方法)

       2.1设置

　　　　 localStorage.setItem("key","val");

       2..2获取

               console.log(localStorage.getItem("key"))

       2.3删除

              localStorage.removeItem("key");

              localStorage.clear();     // 慎用

        2.4 查看总数

              localStorage.length