我正在尝试将 3 个数字类型的输入元素相加。由于某种原因这不起作用。当我取出 if 语句时，它会起作用，但只有在我更改第一个语句(score1)之后才有效。当我改变其他人时，什么也没有发生。谢谢。
function getTotal() {
var score1 = document.getElementById("score1");
var score2 = document.getElementById("score2");
var score3 = document.getElementById("score3");
var sc1 = parseInt(score1.value);
var sc2 = parseInt(score2.value);
var sc3 = parseInt(score3.value);
if (isNan(sc1)) {
sc1 = 0;
}
if (isNan(sc2)) {
sc2 = 0;
}
if (isNan(sc3)) {
sc3 = 0;
}
var total = sc1 + sc2 + sc3;
document.getElementById("totalScore").innerHTML = total;
}
function assign() {
var score1 = document.getElementbyId("score1");
var score2 = document.getElementbyId("score2");
var score3 = document.getElementbyId("score3");
score1.onchange = getTotal;
score2.onchange = getTotal;
score3.onchange = getTotal;
}
<!DOCTYPE html>
<html>
<head>
<script src="getTotal.js" type="text/javascript"></script>
</head>
<body>
<header>
<tbody>
<tr>
<td>
Total:
<output id="total" class="totalScore"></output>
</td>
</tr>
</tbody>
</header>
<table>
<tbody>
<td>Score 1</td>
<td><input type="number" id="score1"/></td>
<td>Score 2</td>
<td><input type="number" id="score2" /></td>
<td>Score 3</td>
<td><input type="number" id="score3" /></td>
</tbody>
</table>
<script type="text/javascript">assign();</script>
</body>
</html>
最佳答案
拼写错误。
var score1 = document.getElementbyId("score1");
var score2 = document.getElementbyId("score2");
var score3 = document.getElementbyId("score3");
如果您检查控制台，您将在调用 Score1 的行上看到错误 Uncaught TypeError: undefined is not a function。选择器是 document.getElement*By*Id，您写的是 by 小写..
关于javascript - 添加输入不会改变 javascript，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26171907/