How to change the data of data in vue

var app3 = new Vue ({

el:"-sharpitem",
data:{
    item_data:[
        
    ],
},
computed:{
},
methods: {

}

});

I want to change the item_data of vue when I click. This is the data. If it can be printed, it is rendered on the page.
goods_box is li

.

li is also traversed with vue, but not the same app

li is app2

for (var j = 0; j < goods_box.length; jPP) {

goods_box[j].addEventListener("click",function(){
    item.style = "left:0;z-index:999";
    //ajax
    var daya = "{name:"550ml",img:["image/1.jpg","image/2.jpg"],p_int:"",pri:"0.99",old_pri:"99",sell:"9999",kg:"550ml",pac:"",qgp:"730",storage:"",car_img:["image/1.jpg","image/2.jpg"]}"
    var items_data = eval("("+ daya +")");

/ / app3.item_data = data;
/ / console.log (app3.item_data); 

},false);
Html5 javascript vue.js
Mar.02,2021

1. Instead of using jQuery to manipulate dom binding events with vue, register events
2 with @ click in the template. There is no direct access to the data object outside the component instance of vue. Changes will not take effect because vue cannot detect changes

this can be solved by component-based application construction,

html: 

<div id="box">
    <todo-item v-for="item in datas" :todo="item" :key="item.name"></todo-item>
</div>

<button onclick="fun()"></button>

js: 

Vue.component('todo-item',{
    props:['todo'],
    template:'<li>{{todo.name}}</li>'
});
var app = new Vue({
    el:'-sharpbox',
    data:{
        datas:[
            {name:''}
        ]
    }
});


function fun(){
    setTimeout(function(){
        app.datas = [{name:''}]
    },500);
    app.datas = [{name:'.....'}]
}

this can be changed by events.

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