Question

我有一个来自服务器的JSON对象。

如果我跑

console.log(msg);

我从控制台得到了这个 screenshot

如何从Object获取密钥或所有密钥？我试过了

console.log(msg.Object.key)

但抱怨

财产＆＃39;对象＆＃39;类型＆＃39; {}＆＃39;
上不存在

任何帮助将不胜感激

编辑：

listener.subscribe((msg:any) => {

      console.log((msg.data[0]));

这是有效的，我有输出

对象{键：＆＃34; IL_IMAGER＆＃34;，值：＆＃34; 2.7872460627869＆＃34;}

但我只想要密钥

我试过了：

console.log((msg.data[0].key));

但是

错误类型错误：无法读取属性＆＃39;键＆＃39;未定义的

解决了问题。这是因为我在服务器中有两个对象，其中一个没有＆＃39;值＆＃39; 。

所以这将是答案：

  console.log((msg.data[0].key));

Answer 1

查看您的屏幕截图，您有这样的数据

＆＃13;

var arr = [{"id":"X","price":"5","size":"5"},
          {"id":"Y","price":"10","size":"5"},
          {"id":"X","price":"5","size":"5"},
          {"id":"Y","price":"10","size":"5"},
          {"id":"Z","price":"5","size":"5"},
          {"id":"X","price":"5","size":"5"},
          {"id":"X","price":"5","size":"5"},
          {"id":"Z","price":"5","size":"5"},
          {"id":"Q","price":"11","size":"5"}]; 

var test = arr.map((data) => {
	return data.id;
});
console.log(test);

＆＃13;

在Angular中使用

let keys = yourArray.map((item) => {
    return item.key;
});

如何在JSON对象中获取密钥

1 个答案: