<!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>
