<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>四则运算</title>
</head>
<body>
<button onclick="cc()"/>点击进行四则运算</button>
<script type="text/javascript">
function cc(){
var number1=prompt("请输入第一个数字","");
number1=parseFloat(number1);
var number2=prompt("请输入第二个数字","");
number2=parseFloat(number2);
var operator=prompt("请输入运算符","");
var res=0;
switch(operator){
case "+":
res=number1+number2
break;
case "-":
res=number1-number2
break;
case "*":
res=number1*number2
break;
case"/":
res=number1/number2
break;
}
alert(number1+operator+number2+"="+res)
}
</script>
</body>
</html>
