问题描述
我想根据用户键循环从 snapshot.val() 收到的数据并将它们推送到数组中.我尝试在 for..in 这样的循环的帮助下做到这一点，
I want to loop through the data I receive from snapshot.val() based on user keys and push them into an array. I tried doing it with the help of for..in loop like this,
firebase.database().ref('interests').child("I would like to dine with").on('value', (snapshot) => {
var data = snapshot.val();
if(snapshot.exists()){
for(let key in data){
console.log("data[key]",data[key]);
this.intVal.push(data[key]);
console.log("intVal",this.intVal);
}
}
})
但我得到了这样的东西，
But I'm getting something like this,
如果您注意到，我的第一个数组在用户键下包含 1 个对象，而我的第二个数组在其用户键下包含 3 个对象.如何将每个值推送到单独的数组中?
If you notice, my first array contains 1 object under a user key and my second array contains 3 objects under their user keys. How can I push every single value in a separate array?
任何帮助将不胜感激！谢谢
Any help would be much appreciated! Thanks
推荐答案
有一个 DataSnapshot.forEach() 方法 正是为了这个目的:
There is a DataSnapshot.forEach() method precisely for this purpose:
firebase.database().ref('interests').child("I would like to dine with").on('value', (snapshot) => {
snapshot.forEach((child) => {
console.log(child.key, child.val());
this.intVal.push(child.val());
console.log("intVal",this.intVal);
});
}
})
这篇关于如何遍历从 snapshot.val() 收到的数据并根据键将其推送到数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！