- it技术
- JavaScript简单计算器
## JavaScript简单计算器
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>简易计算器
</title>
</head>
<br>
<input type="text" id="num1" size="50">
<select id="select">
<option value="+">+
</option>
<option value="-">-
</option>
<option value="*">*
</option>
<option value="/">/
</option>
</select>
<input type="text" id="num2" size="50">
<input type="button" value="计算" onclick="count()"></br>
<input type="text" id="num3" size="50">
</body>
<script>
function count(){
var num1=document.getElementById("num1").value;
var num2=document.getElementById("num2").value;
var c=document.getElementById("select").value;
num1=parseFloat(num1);
num2=parseFloat(num2);
switch (c) {
case "+":document.getElementById("num3").value=parseInt(num1)+parseInt(num2);
break;
case "-":document.getElementById("num3").value=parseInt(num1)-parseInt(num2);
break;
case "*":document.getElementById("num3").value=parseInt(num1)*parseInt(num2);
break;
case "/":document.getElementById("num3").value=parseInt(num1)/parseInt(num2);
break;
}
}
</script>
</html>
图解
