此javascr ipt程序是一个网页特效，可以让多彩的星星跟随鼠标移动。它利用了document对象与滤镜的知识。-This javascr ipt program is a Web page special effects, allows to follow the mouse colorful stars. It uses a document object with the filter of knowledge.

textArea获取焦点,根据鼠标的位置自动筛选出想要的信息-textArea gets focus, according to the position of the mouse automatically filter out the desired information