Vue js MQTT connection problems - vue.js

Question

I want to put 'mqtt' value in span. But it doesn't work.
I think the loading method is wrong, but I don't know how to do it.
I don't know if the code below will suffice. Any help would be greatly appreciated.
Someone else coded similar to one page. Someone else's code has a value in 'detail', but my code doesn't. Why?
HTML
span{{ detail }}span //empty with nothing
Front script1
export default {
props: {
detail: {
type: Object
},
isAdd: {
type: Boolean,
default: false
},
},
data() {
return {};
},
mounted() {
this.$mqtt.subscribe('#');
},
methods: {
SendData() {
var temp = [];
var name = Number(document.getElementsByClassName('name').innerHTML);
temp.push(name);
var temp_current = data.payload.Temp_Current;
var error = data.payload.Error;
var data = {
//workcd: this.detail.namemodel,
Temp_Current: temp_current,
Error: error,
};
data = JSON.stringify(data);
var pub_name_arr = this.detail.name.split(' ');
var pub_name = 'CCComandTopic';
this.$mqtt.publish(
pub_name + '/' + pub_name_arr[1] + '/' + pub_name_arr[2],
data,
);
},
}
}
Front script 2
showHotrunner(namemodel, name, data) {
this.$modal.show(
Hotrunner,
{detail: {namemodel, name, data}, isAdd: true},
{width: '1040', height: '700', draggable: true},
);
const canvas = document.getElementById('three-canvas');
canvas.classList.add('noclick');
}
Back
var device = msg.topic.split("/")[2]
if(device == "hopper")
{
var temp_current = msg.payload.Temp_Current
var error = msg.payload.error
msg = {
topic : "CCComandTopic/hopper/1",
payload : {
ID: id,
"Error": error,
Temp_Current: temp_current,
}
}.
node.send(msg)
}