js localStorage写浏览记录，并删除单条记录和从记录中取值

在做一个选择商品时，需要保存用户的查找记录，类似与淘宝的历史记录，我是用的localStorage，菜鸟一枚，各大神指点

将用户每次浏览的数据push到数组中，每浏览一次push一次，

然后将数组转成字符串JSON.stringify(arr)，然后存储到本地

remb: function (Odata, title, key) {
            var that = this;
            //存储浏览记录//key 0国产，1进口，2VIN
            var arr = [];
            arr.push({ "value": Odata, "title": title, "key": key });
            if (that.setstg != null) {
                if (that.setstg.length != 0) {
                    that.setstg = that.setstg.concat(arr);
                } else {
                    that.setstg = arr;
                }
            } else {
                that.setstg = arr;
            }
            var str = JSON.stringify(that.setstg);
            localStorage.setItem('local', str);
            this.setstg = JSON.parse(localStorage.getItem('local'));
            console.log('记录', that.setstg);
        },

选择一条浏览记录

 // 选择浏览记录
        sel_contry: function (num) {
            var that = this;
            this.con_index = num;
            if (num == 1) {
                var str = JSON.parse(localStorage.getItem('local'))
                if (str != null) {
                    that.setstg = str;
                    console.log('点击记录', that.setstg)
                } else {
                    that.setstg = [];
                }

            }


        },

删除一条浏览记录，需从数组中删除此条，其余保存本地

  // 删除一条记录
        delete_this: function (index) {
            var that = this;
            if (that.setstg.length != 0) {
                that.setstg.splice(index, 1);
                console.log(that.setstg)
                that.setstg = that.setstg;
            }
            localStorage.setItem('local', JSON.stringify(that.setstg));

        },

各大神有更好的办法，欢迎指点