vue3 $符號的使用

$符號作用是獲取vue的App或實例內部的數據

const HelloVueApp = {
  data() {
    return {
      message: 'Hello Vue!!'
    }
  }
}
console.log();
let a1=Vue.createApp(HelloVueApp).mount('#hello-vue')
console.log(a1.$data.message);

運行輸出
Hello Vue!!