火力点：如何获得一个参考键对象节点

Question

// Creates local "temporary" object for holding employee data 
    var newTrain = { 
     tname: trainName, 
     dest: destination, 
     firstTime: firstTrainTime, 
     freq: frequency 
    }; 

    // Uploads train data to the database 
    trainDataBase.ref().push(newTrain); 

这是我弹“T弄清楚如何找我刚刚在服务器上创建的对象的关键我累之下，但它？回来不确定，也还累VAR =则newkey = trainDatabase.ref.push（newTrain）.KEY但随后创建反对对一个，但我一键搞定

// newKey = trainDataBase.ref(newTrain).key 
    // console.log("nodeKey" , newKey) 
    // Alert 
    console.log("train successfully added"); 

    // Clears all of the text-boxes 
    $("#trainName").val(""); 
    $("#destination").val(""); 
    $("#firstTrainTime").val(""); 
    $("#frequency").val(""); 

    // Prevents moving to new page 
    return false; 
    }); 

Answer 1

也许有更好的方式，但我已经用它来使它工作：

var trainDataBaseRef = trainDataBase.ref().push(); 
trainDataBaseRef.set({ 
    id: trainDataBaseRef.key, 
    // rest of object data 
}); 

走一个厕所处的K其docs额外的方式来做到这一点（Updating or deleting data部分）：

function writeNewPost(...) { 
    var postData = { 
    // data 
    }; 

    // Get a key for a new Post. 
    var newPostKey = firebase.database().ref().child('posts').push().key; 

    // Write the new post's data simultaneously in the posts list and the user's post list. 
    var updates = {}; 
    updates['/posts/' + newPostKey] = postData; 
    updates['/user-posts/' + uid + '/' + newPostKey] = postData; 

    return firebase.database().ref().update(updates); 
}