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  • js判断一年中的多少天

    字符串判断

    <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>
            var year=2016;
            var moth=6;
            var day=22;
            var arr=[31,28,31,30,31,30,31,31,30,31,30,31];
            if(year%4===0 && year%100!==0 || year%400===0){
                arr[1]=29;
            }
          while(moth>1){
            day=arr[moth-2]+day;
            moth--;
          }
        console.log(day);
        </script>
    </body>
    </html>
     
    
    
    
    
    switch判断
    ```<!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>
            var year=2016;
            var moth=1;
            var day=22;
            if(moth>3){
                if(year%4===0 && year%100!==0 || year%400===0){
                    day+=1;
            }
            }
          while(moth>1){
                switch(moth-1){
                    case  1:
                    case 3:
                    case 5:
                    case 7:
                    case 8:
                    case 10:
                    case 12:
                         day=day+31;
                         break;
                    case 2: 
                        day=day+28;
                        break;
                    case 4:
                    case 6:
                    case 9:
                    case 10:
                        day=day+30;
                        break;
                }
                moth--;
          }
          console.log(day);
        </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/cengzhuquan/p/13886455.html
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