我正在尝试为一个简单的物理方程构建一个计算器。使用网络表单收集数据，然后应将答案返回并更新到原始网页上。但是无论我做什么或更改我都无法在网页上显示答案。为什么这不起作用？
HTML:
<!DOCTYPE html>
<html>
<head>
<link href="../../Styles/style.css" rel="stylesheet"/>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="/Scripts/Calculator.js"></script>
<title>Physics calculator</title>
</head>
<body>
<h1>F=MA calculator</h1>
<div>
<img src="fma.jpg">
</div>
<div>
<form>
Force: <input type="text" name="force" id='force'>
</form>
<form>
Mass: <input type="text" name="mass" id='mass'>
</form>
<form>
Acceleration: <input type="text" name="acc" id='acc'>
</form>
<div>
<input type="button" value="Calculate" id='calculate'>
</div>
<div>
<p id='answer'></p>
</div>
</div>
Javascript:
$(document).ready(function() {
$('#calculate').on('click', function() {
var F = $('#force').val();
var M = $('#mass').val();
var A = $('#acc').val();
if (F!=="number" && typeof M==="number" && typeof A==="number") {
var FMA = M*A;
$('#answer').html("The force is " +FMA " Newtons.")
}
else if (typeof M!=="number" && typeof F==="number" && typeof A==="number") {
var MFA = F/A;
var $output2 = $('<p>The mass is ?? kg.</p>');
$('#answer').html("The mass is " +MFA " kg.")
}
else if (typeof A!=="number" && typeof F==="number" && typeof M==="number") {
var AFM = F/M;
$('#answer').html("The acceleration is " +AFM " metres per second sqaured.");
}
else {
$('#answer').html("A calculation error has occurred.");
}
});
});
最佳答案
您有 typeof 和连接错误。
(如果您对Infinite 结果不感兴趣) Try with:
$('#calculate').on('click', function() {
var F = parseInt( $('#force').val(), 10);
var M = parseInt( $('#mass').val(), 10);
var A = parseInt( $('#acc').val(), 10);
var msg = "A calculation error has occurred.";
if (isNaN(F) && M && A) {
msg = "The force is "+ (M*A) +" Newtons.";
} else if (isNaN(M) && F && A) {
msg = "The mass is "+ (F/A) +" kg.";
} else if (isNaN(A) && F && M) {
msg = "The acceleration is "+ (F/M) +" metres per second sqaured.";
}
$('#answer').html(msg);
});
关于javascript - 使用 jQuery 更新网页。为什么这段代码不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25324995/