如果要将对象映射到某个对象(在本例中为属性)。我认为如果你想编写函数式代码， Array.prototype.map 就是你要找的。

​

console.log([
      {name: "Joe", age: 22},
      {name: "Kevin", age: 24},
      {name: "Peter", age: 21}
    ].map(function(elem){
        return elem.name;
    }).join(","));

​

在现代JavaScript中：

​

console.log([
      {name: "Joe", age: 22},
      {name: "Kevin", age: 24},
      {name: "Peter", age: 21}
    ].map(e => e.name).join(","));

​

(fiddle)

如果你想支持不是 ES5 compliant 的旧浏览器，你可以填充它(上面的MDN页面上有一个polyfill )。另一种选择是使用underscorejs的 pluck 方法：

var users = [
      {name: "Joe", age: 22},
      {name: "Kevin", age: 24},
      {name: "Peter", age: 21}
var result = _.pluck(users,'name').join(",")

你可以随时覆盖你的对象的 toString 方法：

​

    var arr = [
        {name: "Joe", age: 22, toString: function(){return this.name;}},
        {name: "Kevin", age: 24, toString: function(){return this.name;}},
        {name: "Peter", age: 21, toString: function(){return this.name;}}
    var result = arr.join(", ");
    console.log(result);

​

我也遇到过使用 reduce 方法，它看起来是这样的：

​

console.log(
        {name: "Joe", age: 22},
        {name: "Kevin", age: 24},