<!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>高效判断质数</title> </head> <body> <script> function isPrime(num){ var temp=parseInt(Math.sqrt(num)) for(var i=2;i<=temp;i++){ if(num%i==0){ return false } } return true } </script> </body> </html>