Question

所以，这个程序需要检查用户输入小数的时间，它应该打印出来＆＃34;不是有效的猜测，再试一次。＆＃34;检查用户是否在IF语句中输入了小数的好方法是什么？

jQuery代码：

$(document).ready(function () {
    $("#chat-box").append('<div class="guess"><br>Guess a number between 1-100</div>');
});
var number = Math.round((Math.random() * 100)) % 100 + 1;

document.getElementById('number').addEventListener('keydown', function (event) {


    if (event.which === 13 || event.keyCode === 13) {
        var guess = this.value;       

            if (guess == number) {               
                $("#chat-box").append('<div class="human">' + guess + '</div>');
                $("#chat-box").append('<div class="comp">You guessed it!</div>');
            } else if (isNaN(guess)) {
                $("#chat-box").append('<div class="human">' + guess + '</div>')
                $("#chat-box").append('<div class="comp">' + guess + ' is not a valid guess. Try again.</div>');
            } else if (guess == 0) {
                $("#chat-box").append('<div class="human">' + guess + '</div>')
                $("#chat-box").append('<div class="comp">' + guess + ' is not a valid guess. Try again.</div>');
            } **else if (parseInt(guess))**  {
                $("#chat-box").append('<div class="human">' + guess + '</div>')
                $("#chat-box").append('<div class="comp">' + guess + ' is not a valid guess. Try again.</div>');
            } else if (guess < number) {
                $("#chat-box").append('<div class="human">' + guess + "</div>")
                $("#chat-box").append('<div class="comp">' + guess + " is too small, guess again.</div>");
            } else if (guess > number) {
                $("#chat-box").append('<div class="human">' + guess + "</div>")
                $("#chat-box").append('<div class="comp">' + guess + " is too big, guess again.</div>");
            } 
        }
});

Answer 1

使用此功能。

if(guess.split('.').length>1){
    $("#chat-box").append('<div class="human">' + guess + '</div>')
    $("#chat-box").append('<div class="comp">' + guess + ' is not a valid guess. Try again.</div>');
}

Answer 2

可能的解决方案之一可能是将RegExp用于这些目的，类似：

var isValid = /^([0-9]){1,2}(\.){1}([0-9]){2}$/.test(inputField.value);

Answer 3

为了检查他们是否输入了非整数，您需要具有可以接收的数字类型。如果您将输入加倍，则可以使用：

while（input <0 || input> 10 ||（input-（int）input）> 0）查看是否输入了浮点值。

虽然这样做似乎有点愚蠢。

如何测试以检查用户是否在文本框中输入了小数？

3 个答案: