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## Number.isInteger() --- ## Definition and Usage `Number.isInteger()` The method is used to determine whether the given Parameter is an integer. --- ## Syntax ```Number.isInteger(num)``` ## Parameter | Parameter | Description | | --- | --- | | num | Required, the number to check. | ## Return Value If it is an integer, return true, otherwise return false. ## Example Check if it is an integer:

Determine if the number is an integer.

document.getElementById("demo").innerHTML = Number.isInteger(123) + "
" + Number.isInteger(-1.23); The above example outputs the result: true false --- ## More Examples

Determine if the following values are integers.

var txt = ""; var message = [123, -123, 1.23, -1.23, 10, "123", 5-2, 2*3, 3/3, 1e5, 0, -0, Infinity, -Infinity, "Hello"]; for (var i = 0; i < message.length; i++) { txt += message + ": " + Number.isInteger(message) + "
"; document.getElementById("demo").innerHTML = txt; } Output result: 123: true -123: true 1.23: false -1.23: false 10: true "123": false 3: true 6: true 1: true 100000: true 0: true -0: true Infinity: false -Infinity: false "Hello": false --- ## Related pages JavaScript Tutorial: (#) JavaScript Reference Manual: (#) --- ❮ (#) (#) ❯ --- **Comments** Copyright © 2014-2024 | [](http://www.miitbeian.gov.cn/) [](http://www.miitbeian.gov.cn/)