js数组的map()方法操作json数组

利用map方法方便获得对象数组中的特定属性值们。例如下面这个例子：

var users = [
  {name: "张含韵", "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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