Javascript。嘿，回報將把朋友[我]放在哪裏？

Question

返回將把朋友[i]放在哪裏？

返回將把朋友[i]放在哪裏？

返回將把朋友[i]放在哪裏？

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

的問題是朋友是一個對象不是一個數組，所以如果你想保持friends作爲對象本身你的循環是錯誤的

，那麼你就需要遍歷該對象的屬性

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

---

或者使用數組，而不是

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