我需要JavaScript数学方面的帮助。我想在h2标签中显示最终结果，但是我不知道该怎么做（我是JavaScript新手）。请帮助并提前致谢。
<!doctype html>
<html>
<head>
<title>Do Math</title>
</head>
<body>
<input type = "number" id = "my_input1"/>
<input type = "number" id = "my_input2"/>
<input type = "button" value = "Add them Together" onclick = "doMath();"/>
<script type = "text/javascript">
function doMath() {
var my_input1 = document.getElementById('my_input1').value;
var my_input2 = document.getElementById('my_input2').value;
//Add them Together and Display
var sum = parseFloat(my_input1) + parseFloat(my_input2);
document.write("<h2>The sum is </h2>", sum);
}
</script>
</body>
</html>
最佳答案
尝试这个
<html>
<head>
<title>Do Math</title>
</head>
<body>
<input type = "number" id = "my_input1"/>
<input type = "number" id = "my_input2"/>
<input type = "button" value = "Add them Together" onclick = "doMath();"/>
<h2 id="output"></h2>
<script type = "text/javascript">
function doMath() {
var my_input1 = document.getElementById('my_input1').value;
var my_input2 = document.getElementById('my_input2').value;
//Add them Together and Display
var sum = parseFloat(my_input1) + parseFloat(my_input2);
document.getElementById('output').innerHTML = "The sum is " + sum;
}
</script>
</body>
</html>
见DEMO