6.3.2 素数与闰年问题.html

javascript即用即差核心对象手册

<script>
   var nmin=prompt("输入判断范围的下界","");
   var nmax=prompt("输入判断范围的上界","");   
   var counter=0;
   nmin=parseInt(nmin);
   nmax=parseInt(nmax);
   var j=0;
   document.write("在["+nmin+","+nmax+"]共发现以下素数：<br>");
   for(var i=nmin;i<=nmax;i++)
     {
		for(j=2;j<i;j++)
		{
		   if(i%j==0)
		       break; 
		}
		if(j==i)
		   {
		      document.write(i+",");
			  counter++;
	       }
	 }
   document.write("<br>共"+counter+"个素数！");
</script>