Javascript。嘿，返回将把朋友[i]放在哪里？

Question

返回将把朋友[i]放在哪里？

返回将把朋友[i]放在哪里？

返回将把朋友[i]放在哪里？

var friends = {
    steve: {
        firstName: "Steve",
        lastName: "Jobs",
        number: "(831)524-2213",
        address: ["531 Recht St.","Hollister","CA","95037"] 
    },
    bill: {
        firstName: "Bill",
        lastName: "Gates",
        number: "(831)524-0349",
        address: ["310 E Dunne Ave", "Morgan Hill", "CA","95037"]
    }
};
var search = function(name){
    for (var i=0;i<friends;i++){
        if (friends[i].firstName === name) {
            console.log(friends[i]);
            return friends[i];
        } 
    }
};

Answer 1

问题是朋友是一个对象而不是一个数组，所以你的循环是错误的

如果要将friends 保留为对象本身，则需要遍历该对象的属性

var search = function (name) {
    for (var key in friends) {
        if (friends.hasOwnProperty(key) && friends[key].firstName === name) {
            console.log(friends[key]);
            return friends[key];
        }
    }
};

演示：Fiddle

---

或者使用数组代替

var friends = [{
    firstName: "Steve",
    lastName: "Jobs",
    number: "(831)524-2213",
    address: ["531 Recht St.", "Hollister", "CA", "95037"]
}, {
    firstName: "Bill",
    lastName: "Gates",
    number: "(831)524-0349",
    address: ["310 E Dunne Ave", "Morgan Hill", "CA", "95037"]
}];
var search = function (name) {
    for (var i = 0; i < friends.length; i++) {
        if (friends[i].firstName === name) {
            console.log(friends[i]);
            return friends[i];
        }
    }
};

演示：Fiddle