opengl数字

不明白啊 = =！

　　//每过一分钟或知刷新页面道都会生成回新的随机数答 <html> <script language="javascript" type="text/javascript"> //返回100-500的随机数 function funGetRandomNum() { return Math.floor(Math.random()*401+100); } </script> <body> <span id="result"> <script language="javascript" type="text/javascript"> document.write(funGetRandomNum()); </script> </span> <script language="javascript" type="text/javascript"> window.setInterval(funGetRandomNum,6000); </script> </body> </html>