var store={
    // 保存
    save:function(key,value){
        localStorage.setItem(key,JSON.stringify(value));
    },
    // 获取
    fetch:function(key){
        return JSON.parse(localStorage.getItem(key)) || [];
    },
    delete: function (key) {
        localStorage.removeItem(key);
    }
};

localStorage的存储、获取、删除操作