很简单的嘛！
http://www.bkjia.com/phpjc/445265.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/445265.htmltecharticlehtml head titleuntitled/title /head body ?php $in=2344; if(ereg(^(-{0,1}|+{0,1})[0-9]+(.{0,1}[0-9]+)$,$in)) echo ok!; else echo sorry,please input again!; ? br很简单的嘛！ /bo...