new Set实现数组去重

// 通过ES6的new Set进行数组去重：

// 1. 数字、字符串数组去重
let arr1 = [1, 2, 3, 1, 2, 3, '1', '1'];
let newArr1 = [...new Set(arr1)];
console.log(newArr1);
// [1, 2, 3, '1']

// 2. 对象数组去重
let arr2 = [
  {a: '1', b: 'q'},
  {a: '1', b: 'q'},
  {a: '2', b: 'e'},
  {a: '2', b: 'e'}
]
let newArr2 = [...new Set(arr2.map(e => JSON.stringify(e)))].map(e => JSON.parse(e))
console.log(newArr2);
// [{a: '1', b: 'q'}, {a: '2', b: 'e'}]