javascript - 变量在函数外声明，在函数内赋值，但函数内赋值的值不在函数外？

Question

我的代码：

var admin = require("firebase-admin");

var serviceAccount = require("./service-account-key.json");

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount)
});



// Get uid from user email
const email = "[e-mail]"; /* This part is for TESTING PURPOSES only! This const will not be here in deployment <3 */

var uid = "N/A";

admin.auth().getUserByEmail(email).then((userRecord) => {
    uid = userRecord.uid;
    
    console.log("Point 1: " + uid);
    /* set();
    get(); */
});

console.log(`Point 2: ${uid}`);

基本上，当我运行代码时，第 1 点输出实际的 UID 分配值，在 GetUserByEmail 中分配，但第 2 点输出 N/A。

如何使函数中分配的内容出现在整个函数之外？

标签： javascriptfirebase-authentication