代码如下：
<!DOCTYPE html>
<html lang="zh">
<head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta http-equiv="X-UA-Compatible" content="ie=edge" /><title>Document</title><script type="text/javascript">var sum = 0;for(var i = 1;i <= 100;i++){var flag = true;if(i == 1)flag = false;for(var j = 2;j < i;j++){if(i % j == 0){flag = false;break;}}if(flag){document.write(i + " ");sum++;}}document.write("<br />质数一共有：" + sum + " 个。");</script>
</head>
<body></body>
</html>
运行结果如下：
