请老师检查是否正确

来源：5-8 编程练习

慕侠635704

2019-12-08 23:07:27

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title> ++和--的运算</title>
</head>
<body>
    <script>
//代码补充
var num1=4,
    num2=5,
    num3=num1+num2,
    num4=num1-num2,
    num5=num1*num2,
    num6=num1/num2;
document.write(num1+"<br/>");//4
document.write(num2+"<br/>");//5
document.write(num3+"<br/>");//9
document.write(num4+"<br/>");//-1
document.write(num5+"<br/>");//20
document.write(num6+"<br/>");//0.8
</script>
</body>
</html>

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