[英]Need help getting output to show using Javascript
我需要在表格下方的跨度中顯示2個數字的輸出(總和,差,乘積,商)。 我嘗試了許多變體,但根本無法得到總和等。 請幫助我是Java語言的菜鳥!!! 謝謝!
function calculate() {
'use strict';
// Read the first text box and convert to a float
var input = document.getElementById('number1').value;
var number1 = parseInt(input);
var input = document.getElementById('number2').value;
var number2 = parseInt(input);
// Calculations
sum = number1 + number2;
difference = number1 - number2;
product = number1 * number2;
quotient = number1 / number2;
// Display the results in relevant spans
document.getElementById('sum').value = sum;
document.getElementById('difference').value = difference;
document.getElementById('product').value = product;
document.getElementById('quotient').value = quotient;
return false;
}
function init() {
'use strict';
document.getElementById('theForm').onsubmit = calculate;
}
window.onload = init;
HTML
<form action="" method="post" id="theForm">
<fieldset>
<div><label for="number1">Number 1</label>
<input type="text" name="number1" id="number1" required>
</div>
<div><label for="number2">Number 2</label>
<input type="text" name="number2" id="number2" required>
</div>
<br />
<div><input type="submit" value="Calculate"></div>
</fieldset>
</form>
<span id="sum"></span><br />
<span id="difference"></span><br />
<span id="product"></span><br />
<span id="quotient"></span><br />
要將值分配給span標簽,我們需要使用innerHTML
屬性,而不是value
。
document.getElementById('sum').innerHTML = sum;
document.getElementById('difference').innerHTML = difference;
document.getElementById('product').innerHTML = product;
document.getElementById('quotient').innerHTML = quotient;
和改變
<form action="" method="post" id="theForm">
至
<form action="" method="post" id="theForm" onsubmit="return calculate()">
您只需要在表單提交時調用calculate
函數即可。
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