如何从 firebase web 检索特定数据

Question

firebase的json文件就像

 { "users": { "a540678c0fda89f430bfba480ffe6f40146548bad72c199f8536b167fc58455a" : { "password" : "2a97516c354b68848cdbd8f54a226a0a55b21ed138e207ad6c5cbb9c00aa5aea", "phone" : "+91xxxxxxx", "uid" : "demo" } } }

我如何使用 ref().once().then() 语法获取密码、电话和 uid 的值

Answer 1

这应该有效：

var ref = firebase.database().ref("users/a540678c0fda89f430bfba480ffe6f40146548bad72c199f8536b167fc58455a");
ref.once("value").then(function(snapshot) {
  var user = snapshot.val();
  console.log(user.password, user.phone, user.uid);
});