JavaScript 实现拖拽生成自由落体方块

<!DOCTYPE html public "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>Simple xhtml page</title> <style> div.container{ position:absolute; border:1px solid #333; font-size:0px; filter: alpha(opacity=60); opacity: 0.6; } </style> </head> <body>  </body> </html>

[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]