判断内层数组对象中的某个值，根据内层数组的另一个值对外层数组排序

//判断name == bb，以num对外层data进行排序
let bb = 'alala';
var data  = [{
    name :  "jiang",
    age :  22,
    father: [{name: 'lalala', aihao: 'bo',num: 60},{name: 'alala', aihao: 'bo',num: 90}]
  }, {
    name :  "pander",
    age :  21,
    father: [{name: 'lalala', aihao: 'bo',num: 30},{name: 'alala', aihao: 'bo',num: 40}]
  }, {
    name :  "krome",
    age :  25,
    father: [{name: 'lalala', aihao: 'bo',num: 40},{name: 'alala', aihao: 'bo',num: 70}]
  },
   {
    name :  "Koges",
    age :  20,
    father: [{name: 'lalala', aihao: 'bo',num: 20},{name: 'alala', aihao: 'bo',num: 50}]
  },];
 const aa = data.sort((a,b)=>
 {
  return (b.father[(b.father|| []).findIndex((father) => father.name === bb)].num) - 
  (a.father[ (a.father|| []).findIndex((father) => father.name === bb)].num)
})
 console.log(aa);


//打印
[
  { name: 'jiang', age: 22, father: [ [Object], [Object] ] },
  { name: 'krome', age: 25, father: [ [Object], [Object] ] },
  { name: 'Koges', age: 20, father: [ [Object], [Object] ] },
  { name: 'pander', age: 21, father: [ [Object], [Object] ] }
]