<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>判断是否是质数</title> </head> <body> <script> function isPrime(num){ for(var i=2;i<num;i++){ if(num%i==0){ return false } } return true } </script> </body> </html>