字符串转数字

Question

const str = '123'

const num1 = +str
const num2 = Number(str)
const num3 = parseFloat(str)
// 大数时
const num4 = BigInt(str)
const num5 = ~~str

console.log({
    num1,
    num2,
    num3,
    num4,
    num5
})