我有两个目的person：
var p1 = {firstName:"John", lastName:"Doe", age:46};
var p2 = {firstName:"Joanne", lastName:"Doe", age:43};
如何将这些对象添加到persons数组并按索引访问它？
我所知道的只是初始化了persons：
var persons = [
{firstName:"John", lastName:"Doe", age:46},
{firstName:"Joanne", lastName:"Doe", age:43}
];
要创建一组人员：
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循环或任何一种循环：
for (var i = 0; i < persons.length; i++) {
console.log( persons[i].firstName ); // writes first names to console
}
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