我有一個(gè)包含對(duì)象的對(duì)象。我想返回一個(gè)新對(duì)象，該對(duì)象僅包含具有特定值屬性的對(duì)象。const object = {  a: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},  b: {prop1: 'jkl', prop2: 'mno', prop3: 'pqr'},  c: {prop1: 'abc', prop2: 'def', prop3: 'ghi'},  d: {prop1: 'abc', prop2: 123, prop3: 'ghi'}};let group = {};for (let key in object) {  if (object[key].prop1 === 'abc') {    group += object[key];  }  console.log(object[key].prop1);}console.log(group);