老师，帮检查，代码哪里需要改进
<!DOCTYPE html>
<html>
<head>
<title></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 oNum1 = document.getElementById('num1');
var oOperate = document.getElementById('operate');
var oNum2 = document.getElementById('num2');
var oBtn = document.getElementById('btn');
var oResult = document.getElementById('result');
oBtn.onclick = function(){
console.log(Number(oNum1.value))
// oResult.value =Number(oNum1.value) + oOperate.value + Number(oNum2.value)
switch(oOperate.value){
case '+':
oResult.value = Number(oNum1.value) + Number(oNum2.value);
break;
case '-':
oResult.value = Number(oNum1.value) - Number(oNum2.value);
break;
case '*':
oResult.value = Number(oNum1.value) * Number(oNum2.value);
break;
case '/':
oResult.value = Number(oNum1.value) / Number(oNum2.value);
break;
}
}
</script>
</body>
</html>9
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