JS 中LocalStorage和SessionStorage的使用

//根据key获取对应的值;
window.sessionStorage.getItem(key);
window.localStorage.getItem(key);
//新增key-value,若key已存在,则更新value;
window.sessionStorage.setItem(key,value);
window.localStorage.setItem(key,value);
//根据key移除对应的值
window.sessionStorage.removeItem(key);
window.localStorage.removeItem(key);
//移除全部key-value
window.sessionStorage.clear();
window.localStorage.clear();
//根据索引获取对应key
window.sessionStorage.key(index);
window.localStorage.key(index);