javascript - text input how to accept only positive whole numbers only

Question

如何验证文本框输入仅允许整数和正数？

Answer 1

Check out the HTML5 input type="number", you can set min=1 and no max and it will only allow positive whole numbers.

http://www.w3schools.com/html/tryit.asp?filename=tryhtml_input_number

EDIT: If you just want to use JavaScript, you could try something like this:

if (Number.isInteger(num) && num >= 0) {
    //true
}