对象的key
是否倒序, 默认是正序
arr.sort(sortCallBackNumber('age')) => [{age: 18}, {age: 20}]arr.sort(sortCallBackNumber('age', true)) => [{age: 20}, {age: 18}] Copy
arr.sort(sortCallBackNumber('age')) => [{age: 18}, {age: 20}]arr.sort(sortCallBackNumber('age', true)) => [{age: 20}, {age: 18}]
对象的key