访问嵌套在Javascript中另一个对象内的对象的属性

Question

我正在尝试访问嵌套在对象中的对象的属性。我是以错误的方式接近它，我的语法是错误的，还是两者兼而有之？我内部有更多'联系人对象，但是删除它们以缩小这个帖子。

var friends = {
    steve:{
        firstName: "Rob",
        lastName: "Petterson",
        number: "100",
        address: ['Thor Drive','Mere','NY','11230']
    }
};

//test notation this works:
//alert(friends.steve.firstName);

function search(name){
    for (var x in friends){
        if(x === name){
               /*alert the firstName of the Person Object inside the friends object
               I thought this alert(friends.x.firstName);
               how do I access an object inside of an object?*/
        }
    }
}  

search('steve');

Answer 1

要么是

friends.steve.firstName

或

friends["steve"].firstName

但是你不需要for循环：

function search(name){
    if (friends[name]) alert(friends[name].firstName);
}