js 取整、取模、取商

//取模
document.write(1%2);
document.write(5%2);
//求商
console.log(1/2);
console.log(5/2);
//取整
console.log(parseInt(1/2));
console.log(parseInt(5/2));
//向上取整
console.log(Math.ceil(1/2));
//向下取整
console.log(Math.floor(5/2));