我无法将当前用户传递到 Parse.User.currentAsync().then(function(user)){} 之外

Question

我想让当前用户在公共场合使用，但在 Parse.User.currentAsync((.then(function(user( 当前用户未定义，如何将其传递给变量？

 var userName;
 Parse.User.currentAsync().then(function(user) {
           userName =  user.get('username')  
   });
 alert(userName) //undefined
 ......
 user.equalTo("username", userName); //userName is undefined
 user.find().then(results => {
  for(const result of results) { ....

Answer 1

const user = await Parse.User.currentAsync();
alert(user.getUsername());