util.js
export let sum = (x,y) => {
return x + y;
}
export let minus = (m,n) => {
return m - n;
}
main.js
import {num,minus} from './util' 或
import * as util from './util'
console.log(`sum:${sum(1,6)}`) 或
console.log(`sum:${util.minus(10,6)}`)
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