箭头函数

1. 链接：https://javascriptplayground.com/real-life-es6-arrow-fn/

2. var users = [
     { name: ‘Jack‘, age: 21 },
     { name: ‘Ben‘, age: 23 },
     { name: ‘Adam‘, age: 22 },
   ];
   
   console.log(
     users.map(function(user) {
       return user.age;
     })
   );
   // [21, 23, 22]
   
   
   var users = [
     { name: ‘Jack‘, age: 21 },
     { name: ‘Ben‘, age: 23 },
     { name: ‘Adam‘, age: 22 },
   ];
   
   console.log(users.map(user => user.age));
   // [21, 23, 22]
   

   　　

箭头函数

原文：https://www.cnblogs.com/Longhua-0/p/9189243.html