请老师检查
来源：4-14 项目作业
宣与慕
2022-03-16 21:05:13
<!DOCTYPE html>
<html>
<head>
<title>计算器</title>
</head>
<body>
<input type='text' id='num1' />
<select id='operate'>
<option value='+'>+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type='text' id='num2' />
<input type='button' value=' = ' id="btn" />
<input type='text' id='result' />
<script>
var oSelect = document.getElementById('operate');
var num1 = document.getElementById('num1');
var num2 = document.getElementById('num2');
var result = document.getElementById('result');
var btn = document.getElementById('btn');
btn.addEventListener('click', function () {
if (oSelect.value == '+') {
result.value = Number(num1.value) + Number(num2.value);
}
else if (oSelect.value == '-') {
result.value = num1.value - num2.value;
}
else if (oSelect.value == '*') {
result.value = num1.value * num2.value;
}
else if (oSelect.value == '/') {
result.value = num1.value / num2.value;
}
}, true);
</script>
</body>
</html>写回答
1回答
-
好帮手慕久久
2022-03-17
同学你好，代码正确，很棒，祝学习愉快！
0
