Why does the calculation not display the results?
<!doctype html>
<html>
<head>
<meta charset="utf-8 ">
<title>Untitled Document</title>
<style>
section{
background-color:# c9e495;
width:280px;
height:330px;
text-align:center;
padding-top:1px;}
.textBaroder{
border-width:1px;
border-style:solid;}
</style>
< /head>
<body>
<section>
<h1>
<img src= "image/logo.jpg" width="260" height="31">Welcome to Taobao!
</h1>
<form action="" method="post" name="myform" id="myform">
<h3> ;
<img src="file:///F|/17webpage/computer/image/shopping cart.jpg" width="54" height="54">Shopping simple calculator
</h3>
The first number<input name="txtNum1" type="text" class="textBaroder" id="txtNum1" size="25 ">
The second number<input name="txtNum2" type="text" class="textBaroder" id="txtNum2" size="25">
<input name="addButton2" type="button" id="addButton2" value=" " onChange="compute(' ')">
<input name="subButton2" type="button" id="subButton2" value=" - " onChange="compute('-')">
<input name="mulButton2" type ="button" id="mulButton2" value=" × " onChange="compute('*')">
<input name="divButton2" type="button" id="divButton2" value=" ÷ " onChange="compute('/')">
Computation result<INPUT name="textResult" type="text" class="textBaroder" id ="textResult" size="25">
</form>
</section>
<script>
function compute(op)
{
var num1,num2;
num1 = oarseFloat(document.myform .txtNum1.value);
num2 = oarseFloat(document.myform.txtNum2.value);
if (op==" ")
document.myform.txtResult .value = num1 num2;
if (op=="-")
document.myform.txtResult.value = num1-num2;
if (op== "*")
document.myform.txtResult.value = num1*num2;
if (op=="/" && num2!=0)
document. myform.txtResult.value = num1/num2;
}
</script>
</body>
</html>
