<div id="app">
{{count}}
<button @click="increment"> plus </button>
</div>
const {createApp,ref} = Vue
console.clear();
const APP={
setup(){
const count=ref(0);
function increment () {
count.value++;
}
return {
count,
increment
}
}
}
const app=createApp(APP);
app.mount('#app');
External CSS
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