使用getCurrentInstance方法获取data内的数据

import { getCurrentInstance } from "vue";
export default {
  data() {
    return {
      b: "data数据",
    };
  },
  setup() {
    const datab = getCurrentInstance();
    async function getdata(){
    	let dataa=datab.data.b;
    	console.log(dataa)
    }
  },
};