如何检查文件是否存在于火基地存储中?

When using the database you can do snapshot.exists() to check if certain data exists. According to the docs there isn't a similar method with storage.

当使用数据库时，您可以做快照。存在()来检查是否存在某些数据。根据文档，没有类似的存储方法。

https://firebase.google.com/docs/reference/js/firebase.storage.Reference

What is the proper way of checking if a certain file exists in Firebase Storage?

检查某个文件是否存在于Firebase存储中的正确方法是什么?

2 个解决方案

#1

I believe that the FB storage API is setup in a way that the user only request a file that exists.

我认为FB存储API的设置方式是用户只请求存在的文件。

Thus a non-existing file will have to be handled as an error: https://firebase.google.com/docs/storage/web/handle-errors

因此，一个不存在的文件必须作为一个错误处理:https://firebase.google.com/docs/storage/web/handle错误

#2

You can use getDownloadURL which returns a Promise, which can in turn be used to catch a "not found" error, or process the file if it exists. For example:

您可以使用getDownloadURL返回一个承诺，该承诺反过来可以用于捕获“未找到”错误，或者处理存在的文件。例如:

storageRef.child("file.png").getDownloadURL().then(onResolve, onReject);

function onResolve(foundURL) {
    //stuff
}

function onReject(error) {
    console.log(error.code);
}

#1