lovecoding
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VIP26


			
				
					
						
						
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<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 DayOfYear(data1) {
        var year = data1.getFullYear();
        var month = data1.getMonth();
        var day = data1.getDate();
        var months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        // 闰年 29
        if (IsLeapYear(year)) {
          months[1] = 29;
        }
        var dayOfYear = 0;
        for (var i = 0; i < month - 1; i++) {
          dayOfYear += months[i];
        }
        dayOfYear += day;
        return dayOfYear;
      }
      // 判断是不是闰年
      function IsLeapYear(year) {
        if (year % 4 === 0) {
          if (year % 100 === 0) {
            if (year % 400 === 0) {
              return true;
            } else {
              return false;
            }
          } else {
            return true;
          }
        } else {
          return false;
        }
      }
      var data1 = new Date(2000,1,8);
      var result = DayOfYear(data1);
      console.log(result,'输出'); 
    </script>
  </body>
</html>