js判斷一年中的多少天
阿新 • • 發佈：2020-10-27
字串判斷
<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判斷 ```<!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>