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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:
js
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("");
}