老师，可以帮忙优化一下吗，谢谢

来源：5-10 编程练习

Moomin6

2019-05-27 22:51:14

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>员工合同到期时间</title>
</head>
<body>
<script>
    //代码补充
    var num1 = parseInt(prompt("请输入员工的入职年份")),
        num2 = parseInt(prompt("请输入员工的入职月份")),
        num3 = parseInt(prompt("请输入员工的入职时间"));
    function time(num1,num2,num3){
        var date = new Date();
        date.setFullYear(num1);
        date.setMonth(num2);
        date.setDate(num3);
        var year = date.getFullYear(),
            month = date.getMonth(),
            days = date.getDate();
        document.write("该员工入职时间是："+year+"-"+month+"-"+days+"<br/>");
        var dateNew = new Date(year+3,month,days);
        document.write("该员工入职时间是："+dateNew.getFullYear()+"-"+dateNew.getMonth()+"-"+dateNew.getDate());
    }
    time(num1,num2,num3);
</script>
</body>
</html>