javascript中数组get对象内的数组

var arr = [
  { name: 'John', hobbies: ['reading', 'painting'] },
  { name: 'Jane', hobbies: ['swimming', 'dancing'] }
];

var johnHobbies = arr[0].hobbies;
console.log(johnHobbies); // 输出：['reading', 'painting']

var arr = [
  { name: 'John', hobbies: ['reading', 'painting'] },
  { name: 'Jane', hobbies: ['swimming', 'dancing'] }
];

var janeHobbies = arr[1]['hobbies'];
console.log(janeHobbies); // 输出：['swimming', 'dancing']