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在Javascript/jQuery中检查数字是否为整数_Javascript_Jquery - Fatal编程技术网

在Javascript/jQuery中检查数字是否为整数

在Javascript/jQuery中检查数字是否为整数,javascript,jquery,Javascript,Jquery,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 th

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 {
        $('.you-get').hide();
    }
};
我需要的是一个子句,它检查从amount+$currencyTo.find生成的值是否为整数,如果为整数,则在其末尾加上.00。

尝试以下操作:

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();
    }
};
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();
    var val = amount + '' + $currencyTo.find(':selected').text();
    if (val === parseInt(val)){// check if val is an Int
      $('#you-get').text(val.toFixed(2));//add .00 if amount + $currencyTo.find is an Int
    }else{  
      $('#you-get').text(val);
    }
  }else{
    $('.you-get').hide();
  }
};
试试这个:

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();
    var val = amount + '' + $currencyTo.find(':selected').text();
    if (val === parseInt(val)){// check if val is an Int
      $('#you-get').text(val.toFixed(2));//add .00 if amount + $currencyTo.find is an Int
    }else{  
      $('#you-get').text(val);
    }
  }else{
    $('.you-get').hide();
  }
};

你能用余数检查这个数字是不是整数吗?例如

var val = parseFloat(amount) + parseFloat($currencyTo.find(':selected').text());
if ( val % 1 == 0 ) { /* whole number */ } else {/* not whole number */ }
你也可以检查一下!伊斯南瓦尔


这基本上是一个类似问题的答案,请参见

您能用余数检查数字是否为整数吗?例如

var val = parseFloat(amount) + parseFloat($currencyTo.find(':selected').text());
if ( val % 1 == 0 ) { /* whole number */ } else {/* not whole number */ }
你也可以检查一下!伊斯南瓦尔

这基本上是一个类似问题的答案,请参见“有方法”

没有办法


金额=数字金额;比率=数字;这会有帮助吗?也许是数量;我不知道你所说的amount+$currencyTo是什么意思。因为你在+''+amount=Numberamount之间加了一个空格,所以我认为它应该是一个字符串而不是一个数字;比率=数字;这会有帮助吗?也许是数量;我不知道你所说的amount+$currencyTo是什么意思。因为你在+''之间加了空格,所以我认为这应该是一个字符串而不是一个数字。嗨,谢谢,如果变量val中没有小数点,它似乎不会加.00在本例中,toFixed在整数上加.00。您好,谢谢,如果变量val?中没有小数点,它似乎不会加.00:在本例中,toFixed在整数上加.00。