js小数指定小数点后位数

常用的截取两位

let num = 16.36172;

//向下取整
Math.floor(num*100)/100;

//向上取整
Math.ceil(num*100)/100;

//四舍五入
Math.round(num*100)/100;

//四舍五入
num.toFixed(2);

toFixed(四舍五入)

let num = 10.44;

console.log(num.toFixed(1));

//10.5

round(四舍五入)

console.log(Math.round(10.51));

//11

floor(向下取整)

console.log(Math.floor(10.77));

//10

ceil(向上取整)

console.log(Math.ceil(10.1));

//11