利用map方法方便獲得對象數組中的特定屬性值們。例如下面這個例子：
var users = [
{name: "張含韻", "email": "zhang@email.com"},
{name: "江一燕", "email": "jiang@email.com"},
{name: "李小璐", "email": "li@email.com"}
];
var emails = users.map(function (user) { return user.email; });
console.log(emails.join(", ")); // zhang@email.com, jiang@email.com, li@email.com
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