我需要检查一个数字是否不是小数，我正在尝试使用 Number.isInteger() 但不起作用

Question

I want a prompt alert keep popping out until the user enters a number with no decimals, and for some reason, I don't understand Number.isInteger is not working, for example it accepts 4.4 or 8.333... Is it that Number.isInteger evaluate to true with decimals?

check this snippet:

 function till() { let x = prompt("ingrese numero") if (Number.isInteger(parseInt(x)) === false) { till() } } till() console.log("FInally out!")

Answer 1

Your problem is parseInt function just converts x to a Integer thus even you enter 8.333 it is taken as 8.

Here is a simple solution to your problem!

 function till() { let x = prompt("ingrese numero") if (parseInt(x).= parseFloat(x)) { till() } } till() console.log("FInally out!")