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npm i alvincalc -S ## Usage ``` const calc = require('alvincalc')
npm i alvincalc -S
const calc = require('alvincalc')
// 使用加法
const result1 = calc.add(1,2)
console.log(result1)
// 使用减法
const result2 = calc.minus(1,2)
console.log(result2)