<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> </body> </html> <script> //求出 判断一个数是否是质数 // 返回值 boolean // 参数 num function check( num ){ // num 17 2 - 17-1 //标志 let flag = true; for (let i = 2; i < num ; i++) { if ( num % i == 0 ){ flag = false; break; } } return flag; } let num = 24; let b = check(num); console.log(b) </script>
