只需要得到所有的object's values和flatten：

const result = Object.values(holiday_expenses).flat();

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完整片段：

const holiday_expenses = {
  food: [{name: "abc", place: "xyz"}],
  travel: [{name: "abcd", place: "xyz1"}],
  accommodation: [{name: "xysz", place: "xyz2"}]
};

const result = Object.values(holiday_expenses).flat();

console.log(result);

型

import "_" from lodash;
cosnt obj = {/...whatever you have/}
const res = _.values(obj);

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检查“lodash”，我相信它可以让你的生活更好。https://lodash.com/docs/有很多帮助函数来操作数组和对象。