输入年月日输出一年对应天数

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于 2020-08-26 14:24:48 发布

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分类专栏： JavaScript-demo 文章标签： javascript css html html5 css3

本文链接：https://blog.youkuaiyun.com/dsgjava/article/details/108239126

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function isYear(year){
            return year % 4 == 0 && year % 100 !== 0 || year % 400 == 0;
        }
        function getDay(year, month, day){
            var days = day;
            if(month == 1){
                return days;
            }else{
                var arr = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
                for(var i=0; i<month-1; i++ ) {
                    days += arr[i]
                }
            }
            if (isYear(year) && month > 2){
                days++;
            }
            return days;
        }
        console.log(getDay(2020, 8, 12));
    </script>
</body>
</html>