检查number是否为Javascript / jQuery中的整数

Question

我有一些JS：

var updateAmount = function (amount, rate) {
    if (rate > 0 && amount.length > 0 && !isNaN(amount) && amount > 0) {
        amount = Math.round(rate * amount * 100) / 100; // multiply rate with amount and then round to 2 decimals
        $('.you-get').show();
        $('#you-get').text(amount + ' ' + $currencyTo.find(':selected').text());
    } else {
        $('.you-get').hide();
    }
};

我需要的是一个子句，用于检查从中生成的值amount + $currencyTo.find是否为整数，如果再将其.00加到它的末尾。

Answer 1

if(amount === parseInt(amount)) //returns `true` if it's a integer


var updateAmount = function (amount, rate) {
    if (rate > 0 && amount.length > 0 && !isNaN(amount) && amount > 0 && amount === parseInt(amount)) { //Edited this line
        if(amount === parseInt(amount)) amount += '.00'; //Added this line
        amount = Math.round(rate * amount * 100) / 100; // multiply rate with amount and then round to 2 decimals
        $('.you-get').show();
        $('#you-get').text(amount + ' ' + $currencyTo.find(':selected').text());
    } else {
        $('.you-get').hide();
    }
};