数组的去重

/**
 * @param {Array} arr
 * @param {String} field
 * @returns {Array}
 */
export const uniqueArrByField = (arr, field = "") => {
  if (field) { // 根据数组中的某个字段去重
    return arr.reduce((acc, current) => {
        const exists = acc.some(item => item[field] === current[field]);
        if (!exists) {
          acc.push(current);
        }
        return acc;
    }, [])
  } else { // 根据ES6 Set去重
    return Array.from(new Set(arr));
  }
}