对一个联系人列表，里面存储着不同联系人的数组对象。
函数 lookUpProfile 有两个预定义参数：firstName值和prop属性 。
该函数应检查firstName是实际联系人的firstName，给定的属性（prop）是该联系人的属性。
如果它们都存在，函数返回prop属性对应的值。
如果firstName 值不存在，返回 "No such contact"。
如果prop 属性不存在，返回 "No such property"。
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){ for(var i=0;i<contacts.length;i++){ if(firstName==contacts[i].firstName){ var a=1; if(contacts[i].hasOwnProperty(prop)){ var b=1; return contacts[i][prop]; } } } if(a!=1){ return "No such contact"; } if(b!=1){ return "No such property"; } }