How to copy an original content in vue data data

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what I want to achieve is that when jiaClick function is executed, I can add an original data to the original rbars form, which is similar to the shopping cart form
Thank you

var vue = new Vue({
                el: "-sharpfl",
                data: {
                    rbars: [
                        {
                            img: "1.png",
                            title: "1",
                            spec: "",
                            status: [],
                            price: "1",
                            orig: "",
                            stock: 10000,
                            count: 0
                        },
                        {
                            img: "2.png",
                            title: "2",
                            spec: "",
                            status: [],
                            price: "2",
                            orig: "",
                            stock: 10000,
                            count: 0
                        },
                        {
                            img: "3.png",
                            title: "3",
                            spec: "",
                            status: [],
                            price: "3",
                            orig: "",
                            stock: 10000,
                            count: 0
                        },
                    ],
                },
                        methods: {
                    jiaClick: function(e) {
                        var that = this;
                        var idx = parseInt(e.target.dataset.idx);
                        var list = that.rbars;
                        var count = parseInt(list[idx].count);
                        if(count < 0) {
                            count = 1;
                        } else {
                            list[idx].count = count + 1;
                        }
                        that.rbars = list;
                        this.rbars.push()
                    },
                }
            })

for example, if there are three sets of data, when I jiaClick function the second group of data, I will add the second group of data once. How to write

this.rbars_cart.push({ img: list[idx].img, title:list[idx].title, price: list[idx].price, count: list[idx].count });