//tool.js
export const a = () =>()
export const b = () =>()
//tool.js
export default {
    a:()=>()
    b:
    c:
    ...
}
 what"s the difference between these two when webpack compiles? When loading on demand 
 which do you use when writing utility functions? 
 what I want to ask is whether 
 webpack packaging on demand will separate the functions in the first one. For example, if I have a file import {a} 
 webpack, just take out the a function. If you use the object, it must be the whole file 
