javascript - 如何将变量移出作用域？

Question

这个问题已经有答案了:

How do I return the response from an asynchronous call? (42 个回答)

已关闭 6 年前。

如何将变量 userID 移出其范围(一旦从 ajax POST 调用返回)，因为我需要下面的值(在 GET 请求中)？我应该使用回调吗？

firebaseAUTH.signInWithEmailAndPassword(email, password).then(function (user) {
console.log('user has signed in with e-mail address: '+user.email+' and user ID: '+user.uid)
firebaseAUTH.currentUser.getToken(true).then(function(idToken) {
// Send token to your backend via HTTPS (JWT)
$.ajax(
    {
      url: '/auth',
      type: 'POST',
      data: {token: idToken},
      success: function (response){
      var userID = response.userID
      //set database ref, pull out info based on ID
      }})
$.get(
    {
      url: '/members-area/',
      data: {userID: userID}
    })

Answer 1

移动到ajax里面获取成功吗？

$.ajax({
    url: '/auth',
    type: 'POST',
    data: {
        token: idToken
    },
    success: function (response) {
        var userID = response.userID

        $.get({
            url: '/members-area/',
            data: {
                userID: userID
            }
        })
    }
})