JS多次请求接口按顺序依次执行解决办法

// 1、获取用户列表，将第一位用户的门店设置为当前门店
getUsers() {
  return new Promise((resolve, reject) => {
    let data = {
      limit: 999,
      page: 1,
      roleIds: "1,2",
      bindStatus: 0,
    };
    getBuyUserList(data)
      .then((res) => {
        this.userList = res.list;
        if (!this.form.buyId) {
          this.form.buyUserId = res.list[0].userId;
          this.form.shopId = res.list[0].shopId;
        }
        // promise封装的接口里面可以没有return，但是一定要调用 resolve 函数，表明异步任务顺利完成且返回结果值
        resolve();
      })
      .catch((error) => {
        reject(error);
      });
  });
},
///2、设置仓库的默认项
setDefaultSelection() {
  let data = {
    page: 1,
    limit: 10,
    shopId: this.form.shopId,  //只筛选当前门店关联的仓库
  };
  getWarehouseList(data).then((res) => {
    this.warehouseList = res.list;
    if (!this.form.buyId) {
      this.form.warehouseId = this.warehouseList[0].warehouseId;
      this.form.warehouseName = this.warehouseList[0].name;
    }
  });
},
// Vue实例被创建后立即调用接口获取筛选项数据
async created() {
    await this.getUsers();
    this.setDefaultSelection();
}

let p = Promise.resolve("foo");
// 等价于
let p = new Promise((resolve) => {
  resolve("foo");
});

p.then((data) => {
  console.log(data); //输出'foo'
});


var p2 = new Promise(function (resolve, reject) {
  var flag = false;
  if(flag){
    resolve('这是数据2');
  }else{
    reject('这是数据2');
  }
});

p2.then(function(data){//状态为fulfilled时执行
  console.log(data);
  console.log('这是成功操作');
},function(reason){ //状态为rejected时执行
  console.log(reason);
  console.log('这是失败的操作');
});