判斷質數,1到一百內所有質數 js
阿新 • • 發佈:2020-10-27
<!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> for (var i=3;i<=100;i++){ var flag=true; for(var j=2;j<i;j++){ if(i%j===0){ flag=false } } if(flag){ console.log(i+'是質數') } else{ console.log(i+'不是質數') } } </script> </body> </html> <!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 num=20; var flag=true; for (var i=2;i<num;i++ ){ if(num %i ==0){ flag=false } } flag ? console.log(num+'是質數'):console.log(num+'不是質數') </script> </body> </html>