Number system conversion（进制转换）

If you want to convert a number from decimal system to binary system, you can do conversion like the picture shown below:

Corresponding code is like below:

function convertNum (originNum, base) {
    let quotient = originNum
    let remainer
    let arr = []
    while (quotient !== 0) {
        remainer = quotient % base // 取余
        quotient = Math.floor(quotient / base) // 取商
        arr.unshift(remainer)
    }
    return arr.join('')
}