云函数sort 如何根据数组里面对象里面的数组长度进行排序?

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云函数sort 如何根据数组里面对象里面的数组长度进行排序?How does the cloud function sort sort according to the length of the array in the objects in the array?

s数据库内容 =  [{a :1,b:[1]},{a :1,b:[1,2,3]}{a :1,b:[1,2]}]排序后的结果，我希望是 = [{a :1,b:[1,2,3]},{a :1,b:[1,2]}{a :1,b:[1]}]

Sort according to the array length of the objects in the array,. S database content = [{A: 1, B: [1]}, {A: 1, B: [1,2,3]} {A: 1, B: [1,2]}] sorted results, I hope = [{A: 1, B: [1,2,3]}, {A: 1, B: [1,2]} {A: 1, B: [1]}]

鍥炵瓟锛�

arr.sort((m, n) => m.b.length - n.b.length)

.xxx.aggregate().project({  len:$.size("$b")}).sort()