lovecoding
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W260426


			
				
					
						
						
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    <script>
        // 返回本年度的第几天
        // 定义一个数组，一年中每个月的天数
        var months = [31,28,31,30,31,30,31,31,30,31,30,31];

        // 判断是否为闰年
        function isLeapYear(year) {
            return (year%4 == 0 && year%100 != 0) || year%400 == 0;
        }

        // 定义一个函数，返回传入日期的第几天
        function getDayOfYear(year,month,day) {
            if(isLeapYear(year)){
                months[1] = 29;
            }
            var dayOfYear = 0;
            for(var i = 0;i<month-1;i++){
                dayOfYear += months[i];
            }
            dayOfYear += day;
            return dayOfYear;
        }

        // 测试
        console.log(getDayOfYear(2000,2,8));
    </script>
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