使用循环语句查找通讯录
1 //Setup 2 var contacts = [ 3 { 4 "firstName": "Akira", 5 "lastName": "Laine", 6 "number": "0543236543", 7 "likes": ["Pizza", "Coding", "Brownie Points"] 8 }, 9 { 10 "firstName": "Harry", 11 "lastName": "Potter", 12 "number": "0994372684", 13 "likes": ["Hogwarts", "Magic", "Hagrid"] 14 }, 15 { 16 "firstName": "Sherlock", 17 "lastName": "Holmes", 18 "number": "0487345643", 19 "likes": ["Intriguing Cases", "Violin"] 20 }, 21 { 22 "firstName": "Kristian", 23 "lastName": "Vos", 24 "number": "unknown", 25 "likes": ["Javascript", "Gaming", "Foxes"] 26 } 27 ]; 28 29 30 function lookUpProfile(firstName, prop){ 31 32 var hasName = false; 33 //设置标量hasName,作为firstName判定的结果 34 for (var i = 0; i < contacts.length; i++) { 35 if (contacts[i].firstName == firstName) { 36 hasName = true; 37 if (contacts[i].hasOwnProperty(prop)) { 38 return contacts[i][prop]; 39 } else { 40 return "No such property"; 41 } 42 } 43 } 44 45 if(!hasName){ 46 //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 47 return "No such contact"; 48 } 49 50 } 51 52 53 lookUpProfile("Akira", "likes");