JS学习过程中碰到的小问题

使用循环语句查找通讯录

 //Setup
 var contacts = [
 {
 "firstName": "Akira",
 "lastName": "Laine",
 "number": "0543236543",
 "likes": ["Pizza", "Coding", "Brownie Points"]
 },
 {
 "firstName": "Harry",
 "lastName": "Potter",
 "number": "0994372684",
 "likes": ["Hogwarts", "Magic", "Hagrid"]
 },
 {
 "firstName": "Sherlock",
 "lastName": "Holmes",
 "number": "0487345643",
 "likes": ["Intriguing Cases", "Violin"]
 },
 {
 "firstName": "Kristian",
 "lastName": "Vos",
 "number": "unknown",
 "likes": ["Javascript", "Gaming", "Foxes"]
 }
 ];

 function lookUpProfile(firstName, prop){

 var hasName = false;
 //设置标量hasName，作为firstName判定的结果
 for (var i = 0; i < contacts.length; i++) {
     if (contacts[i].firstName == firstName) {
         hasName = true;
         if (contacts[i].hasOwnProperty(prop)) {
             return contacts[i][prop];
         } else {
             return "No such property";
         }
     }
 }

 if(!hasName){
     //等循环执行完之后再对是否有firstName的判定结果进行处理，避免影响prop属性的判定过程
     return "No such contact";
 }

 }

 lookUpProfile("Akira", "likes");