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这是提示：有一个JSON对象，代表着你的专辑集。每一张专辑由一个唯一的id标识，并具有多种属性。但并非所有的专辑都有完整的信息。写一个函数，它有个三个参数，id、prop、value。如果 value !='' 而且prop != 'tracks'，collectionCopy[id][prop]=value;。如果 value !='' 而且prop == 'tracks'，collectionCopy[id][prop].push(value);。如果 value == '' ，delete collectionCopy[id][prop];。这是要求：update(5439, "artist", "ABBA")之后,artist应该为"ABBA"update(2548, "artist", "")之后,artist应该不存在update(1245, "tracks", "Addicted to Love")之后,tracks的最后一个元素应该是"Addicted to Love"update(2548, "tracks", "")之后,tracks应该不存在我代码这样不知道那里有问题：var collection = { 2548: { album: "Slippery When Wet", artist: "Bon Jovi", tracks: [ "Let It Rock", "You Give Love a Bad Name" ] }, 2468: { album: "1999", artist: "Prince", tracks: [ "1999", "Little Red Corvette" ] }, 1245: { artist: "Robert Palmer", tracks: [ ] }, 5439: { album: "ABBA Gold" }};var collectionCopy = JSON.parse(JSON.stringify(collection));function update(id, prop, value) { if(value != " " && prop != "tracks"){ collectionCopy[id][prop] = value; }else if ( value != ' ' && prop == 'tracks'){ collectionCopy[id][prop].push(value); }else if (value == ' '){ delete colectionCopy[id][prop]; } return collection;}update(5439, "artist", "ABBA"); |
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