Question

我有一个person的对象数组：

var p1 = {firstName:"John", lastName:"Doe", age:46};
var p2 = {firstName:"Joanne", lastName:"Doe", age:43};

如何将此数组添加到persons数组并通过索引访问它？

我所知道的就是初始化persons：

var persons = [
    {firstName:"John", lastName:"Doe", age:46},
    {firstName:"Joanne", lastName:"Doe", age:43}
];

Answer 1

创建一组人：

var persons = []; // initialize the array

persons.push({firstName:"John", lastName:"Doe", age:46}); // Add an object

persons.push({firstName:"Joanne", lastName:"Doe", age:43}); // Add another object

要检索特定索引处的值：

persons[1].firstName // "Joanne"
persons[1].lastName  // "Doe"
persons[1].age       // 43

要遍历数组，请使用for循环或任何类型的循环：

for (var i = 0; i < persons.length; i++) {
    console.log( persons[i].firstName ); // writes first names to console
}

Answer 2

创建array literal use []而不是QByteArray ba = Serialize<int>(5); ... int theValue = Deserialize<int>(ba);。

Answer 3

您可以使用push方法添加每个对象遍历您的数组并为每个persons.push(object)循环。

Answer 4

另一种遍历这些人的方法是：

const people = persons.map((person, i) => {
  console.log(persons[i].firstName)
});

Answer 5

您可以使用推送方法它会将对象添加到数组的末尾。

参见示例：

＆＃13;

<script>
var per1 ={firstName:"John", lastName:"Doe", age:46};
var per2 ={firstName:"Johny", lastName:"Doe", age:50};
var persons = [per1,per2];

var per3 ={firstName:"Johnonon", lastName:"Doe", age:52};
persons.push(per3);

</script>

＆＃13;

如何在Javascript中列出对象数组？

5 个答案: